AddressBookSourcesSync Causing Sever Laptop Slow Down

After updating to iOS 5 and Icloud my Laptop has some severe slow down issues. I started the Acitivity Monitor and found that the AddressBookSourcesSync user process is using as much as 90% of the CPU and lots of Memory both virtual and Real Memory. I can stop this process and the system returns to normal. But every time I start up I can not use the computer until I quit the process.
Here is a process sample from the activity monitor.
Sampling process 398 for 3 seconds with 1 millisecond of run time between samples
Sampling completed, processing symbols...
Analysis of sampling AddressBookSourceSync (pid 398) every 1 millisecond
Process:         AddressBookSourceSync [398]
Path:            /System/Library/Frameworks/AddressBook.framework/Versions/A/Resources/AddressBo okSourceSync.app/Contents/MacOS/AddressBookSourceSync
Load Address:    0x10c0f3000
Identifier:      com.apple.AddressBookSourceSync
Version:         1.1 (1062)
Build Info:      AddressBook-1062000000000000~1
Code Type:       X86-64 (Native)
Parent Process:  launchd [279]
Date/Time:       2011-11-04 10:15:26.302 -0500
OS Version:      Mac OS X 10.7.2 (11C74)
Report Version:  7
Call graph:
    1222 Thread_6953   DispatchQueue_1: com.apple.main-thread  (serial)
    + 1222 ???  (in AddressBookSourceSync)  load address 0x10c0f3000 + 0x1220  [0x10c0f4220]
    +   1222 ???  (in AddressBookSourceSync)  load address 0x10c0f3000 + 0x1f38  [0x10c0f4f38]
    +     1222 ???  (in AddressBookSourceSync)  load address 0x10c0f3000 + 0x15a7  [0x10c0f45a7]
    +       1222 -[NSRunLoop(NSRunLoop) runUntilDate:]  (in Foundation) + 66  [0x7fff890fec0a]
    +         1222 -[NSRunLoop(NSRunLoop) runMode:beforeDate:]  (in Foundation) + 267  [0x7fff8907b04f]
    +           1222 CFRunLoopRunSpecific  (in CoreFoundation) + 230  [0x7fff8abfdae6]
    +             1222 __CFRunLoopRun  (in CoreFoundation) + 1617  [0x7fff8abfe471]
    +               1222 __CFRunLoopDoTimer  (in CoreFoundation) + 534  [0x7fff8ac1dad6]
    +                 1222 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__  (in CoreFoundation) + 20  [0x7fff8ac1df84]
    +                   1222 __NSFireDelayedPerform  (in Foundation) + 392  [0x7fff8907b25a]
    +                     1222 ???  (in AddressBookSourceSync)  load address 0x10c0f3000 + 0x1d04  [0x10c0f4d04]
    +                       1222 ???  (in AddressBookSourceSync)  load address 0x10c0f3000 + 0x1e5a  [0x10c0f4e5a]
    +                         1222 ???  (in AddressBookSourceSync)  load address 0x10c0f3000 + 0x213b  [0x10c0f513b]
    +                           1222 -[__NSOperationInternal waitUntilFinishedOrTimeout:]  (in Foundation) + 224  [0x7fff8918a6bd]
    +                             1222 _pthread_cond_wait  (in libsystem_c.dylib) + 890  [0x7fff8be202a6]
    +                               1222 __psynch_cvwait  (in libsystem_kernel.dylib) + 10  [0x7fff8ab06bca]
    1222 Thread_6970   DispatchQueue_2: com.apple.libdispatch-manager  (serial)
    + 1222 _dispatch_mgr_thread  (in libdispatch.dylib) + 54  [0x7fff893aa14e]
    +   1222 _dispatch_mgr_invoke  (in libdispatch.dylib) + 923  [0x7fff893ab5be]
    +     1222 kevent  (in libsystem_kernel.dylib) + 10  [0x7fff8ab077e6]
    1222 Thread_6971   DispatchQueue_6: com.apple.root.default-priority  (concurrent)
    + 1222 start_wqthread  (in libsystem_c.dylib) + 13  [0x7fff8be1fb85]
    +   1222 _pthread_wqthread  (in libsystem_c.dylib) + 316  [0x7fff8be1e3da]
    +     1222 _dispatch_worker_thread2  (in libdispatch.dylib) + 255  [0x7fff893aa799]
    +       1222 _dispatch_call_block_and_release  (in libdispatch.dylib) + 18  [0x7fff893a98ba]
    +         1222 ____NSOQSchedule_block_invoke_2  (in Foundation) + 124  [0x7fff890ca9e6]
    +           1222 -[__NSOperationInternal start]  (in Foundation) + 705  [0x7fff890b7788]
    +             1222 -[NSInvocationOperation main]  (in Foundation) + 42  [0x7fff8918a970]
    +               1222 -[NSInvocation invoke]  (in CoreFoundation) + 132  [0x7fff8ac5b0a4]
    +                 1222 __invoking___  (in CoreFoundation) + 140  [0x7fff8ac5b20c]
    +                   1222 -[PHXCardDAVSource startSync]  (in CardDAVPlugin) + 697  [0x10d48fe59]
    +                     1222 -[PHXCardDAVSource doSyncWithServer:]  (in CardDAVPlugin) + 10411  [0x10d493068]
    +                       1222 -[CDXController syncContainerInfos:inLocalDatabase:multiGetBatchSize:maxSimultRequestsPerFolder :maxSimultImageGets:actionsOnlyIfSuccessfulAction:useActionsAndCTag:usePostIfAva ilable:useSyncReportIfAvailable:maxBulkImportResources:maxBulkCRUDResources:useB ulkChangePrecondition:withTimeout:errors:]  (in CardDAVPlugin) + 426  [0x10d4a7f8a]
    +                         1222 -[CDXController _syncContainerInfos:containerActions:multiGetBatchSize:maxSimultRequestsPerFold er:usePostIfAvailable:useSyncReportIfAvailable:maxBulkImportResources:maxBulkCRU DResources:useBulkChangePrecondition:withTimeout:errors:]  (in CardDAVPlugin) + 1483  [0x10d4a8a49]
    +                           1222 -[CDXController _runRunLoopUntilFinished]  (in CardDAVPlugin) + 140  [0x10d4ab696]
    +                             1222 CFRunLoopRunSpecific  (in CoreFoundation) + 230  [0x7fff8abfdae6]
    +                               1222 __CFRunLoopRun  (in CoreFoundation) + 905  [0x7fff8abfe1a9]
    +                                 1222 __CFRunLoopDoSources0  (in CoreFoundation) + 253  [0x7fff8abd73bd]
    +                                   1222 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__  (in CoreFoundation) + 17  [0x7fff8abd7b51]
    +                                     1222 MultiplexerSource::perform()  (in CFNetwork) + 212  [0x7fff87fd4ca2]
    +                                       1222 URLConnectionClient::processEvents()  (in CFNetwork) + 185  [0x7fff87fd4dfd]
    +                                         1222 URLConnectionClient::ClientConnectionEventQueue::processAllEventsAndConsumePayl oad(XConnectionEventInfo<XClientEvent, XClientEventParams>*, long)  (in CFNetwork) + 1354  [0x7fff880a9efa]
    +                                           1222 URLConnectionClient::ClientConnectionEventQueue::processAllEventsAndConsumePayl oad(XConnectionEventInfo<XClientEvent, XClientEventParams>*, long)  (in CFNetwork) + 862  [0x7fff880a9d0e]
    +                                             1222 URLConnectionClient::_clientDidFinishLoading(URLConnectionClient::ClientConnect ionEventQueue*)  (in CFNetwork) + 296  [0x7fff87ff9ee2]
    +                                               1222 _NSURLConnectionDidFinishLoading  (in Foundation) + 81  [0x7fff890d7692]
    +                                                 1222 ___NSURLConnectionDidFinishLoading_block_invoke_1  (in Foundation) + 122  [0x7fff890d7712]
    +                                                   1222 -[CoreDAVContainerMultiGetTask finishCoreDAVTaskWithError:]  (in CoreDAV) + 1299  [0x7fff8b321c19]
    +                                                     1222 -[CoreDAVTask finishCoreDAVTaskWithError:]  (in CoreDAV) + 272  [0x7fff8b3375be]
    +                                                       1222 -[CDXLocalDB containerSyncTask:retrievedAddedOrModifiedActions:removed:]  (in CardDAVPlugin) + 514  [0x10d4b18d5]
    +                                                         1222 -[CDXLocalDB _saveChanges:inFolderWithURL:]  (in CardDAVPlugin) + 902  [0x10d4b1c79]
    +                                                           1222 -[PHXSource _mergeSimilarRecords:]  (in AddressBook) + 72  [0x7fff8cdd6495]
    +                                                             1222 -[ABSimilarRecordMerger matchAndMergeRecords:]  (in AddressBook) + 1037  [0x7fff8ceb91ba]
    +                                                               1222 -[ABSimilarRecordMerger applyPeopleFilters]  (in AddressBook) + 295  [0x7fff8ceb7be4]
    +                                                                 1222 ABRunWithAutoreleasePool  (in AddressBook) + 58  [0x7fff8ccc716b]
    +                                                                   1222 -[ABSimilarRecordMerger applyFilter:importRecords:destRecords:]  (in AddressBook) + 285  [0x7fff8ceb7d4f]
    +                                                                     635 -[ABSimilarRecordMerger bucketInHashTable:forRecord:]  (in AddressBook) + 89  [0x7fff8ceb8d8f]
    +                                                                     ! 635 CFDictionarySetValue  (in CoreFoundation) + 252  [0x7fff8abd2a8c]
    +                                                                     !   635 CFBasicHashSetValue  (in CoreFoundation) + 1871  [0x7fff8abd321f]
    +                                                                     !     635 __CFDictionaryEquateKeys  (in CoreFoundation) + 46  [0x7fff8abe399e]
    +                                                                     !       635 _peopleAreIdentical  (in AddressBook) + 30  [0x7fff8ceba3da]
    +                                                                     !         604 ABPeopleAreIdentical  (in AddressBook) + 324  [0x7fff8ced1ec1]
    +                                                                     !         : 305 _propertyIsIdentical  (in AddressBook) + 36  [0x7fff8ced1d05]
    +                                                                     !         : | 267 -[ABRecord valueForProperty:]  (in AddressBook) + 139  [0x7fff8ccd4dee]
    +                                                                     !         : | + 264 -[ABRecord nts_ValueForProperty:]  (in AddressBook) + 25  [0x7fff8ccd4f01]
    +                                                                     !         : | + ! 264 -[ABRecord nts_ValueForProperty:row:]  (in AddressBook) + 48  [0x7fff8ccd4f33]
    +                                                                     !         : | + !   213 -[ABCDRecord nts_ValueForProperty:row:record:]  (in AddressBook) + 192  [0x7fff8ccd50e1]
    +                                                                     !         : | + !   : 202 -[ABCDRecord copyMultiValueWithRecord:withProperty:]  (in AddressBook) + 68  [0x7fff8cd802e2]
    +                                                                     !         : | + !   : | 147 -[ABMultiValueCoreDataWrapper initWithRecord:managedObject:property:]  (in AddressBook) + 177  [0x7fff8cd870bb]
    +                                                                     !         : | + !   : | + 42 +[ABMultiValueCoreDataWrapper populateIdentifiers:values:labels:primaryIdentifier:withDataFromRecord:managedO bject:property:]  (in AddressBook) + 1354  [0x7fff8cd87a67]
    +                                                                     !         : | + !   : | + ! 18 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 206  [0x7fff8cd80fb4]
    +                                                                     !         : | + !   : | + ! : 13 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 687  [0x7fff8cd81528]
    +                                                                     !         : | + !   : | + ! : | 9 -[_NSFaultingMutableSet allObjects]  (in CoreData) + 52  [0x7fff938f15d4]
    +                                                                     !         : | + !   : | + ! : | + 3 -[NSSet allObjects]  (in CoreFoundation) + 398  [0x7fff8ac4b03e]
    +                                                                     !         : | + !   : | + ! : | + ! 2 +[NSArray arrayWithObjects:count:]  (in CoreFoundation) + 49  [0x7fff8ac275e1]
    +                                                                     !         : | + !   : | + ! : | + ! : 1 -[NSObject retain]  (in CoreFoundation) + 18  [0x7fff8abf5ff2]
    +                                                                     !         : | + !   : | + ! : | + ! : | 1 _objc_rootRetain  (in libobjc.A.dylib) + 108  [0x7fff8d0eb255]
    +                                                                     !         : | + !   : | + ! : | + ! : |   1 objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*>, objc::DenseMapInfo<unsigned long> >::FindAndConstruct(objc_object* const&)  (in libobjc.A.dylib) + 32  [0x7fff8d0eb29a]
    +                                                                     !         : | + !   : | + ! : | + ! : |     1 objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*>, objc::DenseMapInfo<unsigned long> >::LookupBucketFor(objc_object* const&, std::__1::pair<objc_object*, unsigned long>*&) const  (in libobjc.A.dylib) + 95  [0x7fff8d0eb327]
    +                                                                     !         : | + !   : | + ! : | + ! : 1 -[NSObject retain]  (in CoreFoundation) + 0  [0x7fff8abf5fe0]
    +                                                                     !         : | + !   : | + ! : | + ! 1 objc_msgSend  (in libobjc.A.dylib) + 40  [0x7fff8d0e7ea8]
    +                                                                     !         : | + !   : | + ! : | + 3 -[NSSet allObjects]  (in CoreFoundation) + 357,1,...  [0x7fff8ac4b015,0x7fff8ac4aeb1,...]
    +                                                                     !         : | + !   : | + ! : | + 2 objc_msgSend  (in libobjc.A.dylib) + 15  [0x7fff8d0e7e8f]
    +                                                                     !         : | + !   : | + ! : | + 1 -[NSSet allObjects]  (in CoreFoundation) + 371  [0x7fff8ac4b023]
    +                                                                     !         : | + !   : | + ! : | +   1 -[NSSet getObjects:count:]  (in CoreFoundation) + 304  [0x7fff8ac4b1c0]
    +                                                                     !         : | + !   : | + ! : | +     1 __CFBasicHashFastEnumeration  (in CoreFoundation) + 1  [0x7fff8ac274f1]
    +                                                                     !         : | + !   : | + ! : | 2 objc_msgSend  (in libobjc.A.dylib) + 15  [0x7fff8d0e7e8f]
    +                                                                     !         : | + !   : | + ! : | 1 -[_NSFaultingMutableSet allObjects]  (in CoreData) + 27  [0x7fff938f15bb]
    +                                                                     !         : | + !   : | + ! : | + 1 -[_NSFaultingMutableSet willRead]  (in CoreData) + 1  [0x7fff938ed011]
    +                                                                     !         : | + !   : | + ! : | 1 -[_NSFaultingMutableSet allObjects]  (in CoreData) + 1  [0x7fff938f15a1]
    +                                                                     !         : | + !   : | + ! : 3 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 670  [0x7fff8cd81517]
    +                                                                     !         : | + !   : | + ! : | 1 -[NSManagedObject valueForKey:]  (in CoreData) + 61  [0x7fff938ecb9d]
    +                                                                     !         : | + !   : | + ! : | + 1 _PFRawIndexForKnownKey  (in CoreData) + 65  [0x7fff9388dbc1]
    +                                                                     !         : | + !   : | + ! : | +   1 _PFRawFastIndexForKnownKey  (in CoreData) + 73  [0x7fff9388dcc9]
    +                                                                     !         : | + !   : | + ! : | +     1 CFStringGetCStringPtr  (in CoreFoundation) + 6  [0x7fff8abd05c6]
    +                                                                     !         : | + !   : | + ! : | 1 -[NSManagedObject valueForKey:]  (in CoreData) + 91  [0x7fff938ecbbb]
    +                                                                     !         : | + !   : | + ! : | 1 objc_msgSend  (in libobjc.A.dylib) + 30  [0x7fff8d0e7e9e]
    +                                                                     !         : | + !   : | + ! : 2 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 91  [0x7fff8cd812d4]
    +                                                                     !         : | + !   : | + ! :   2 +[ABCDRecord entityNameForPropertyKey:]  (in AddressBook) + 25  [0x7fff8ccd0979]
    +                                                                     !         : | + !   : | + ! :     1 -[NSDictionary(NSKeyValueCoding) valueForKey:]  (in Foundation) + 1  [0x7fff89078404]
    +                                                                     !         : | + !   : | + ! :     1 objc_msgSend  (in libobjc.A.dylib) + 40  [0x7fff8d0e7ea8]
    +                                                                     !         : | + !   : | + ! 9 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 726  [0x7fff8cd811bc]
    +                                                                     !         : | + !   : | + ! : 9 +[NSDictionary dictionaryWithObjects:forKeys:]  (in CoreFoundation) + 49  [0x7fff8aca0371]
    +                                                                     !         : | + !   : | + ! :   4 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 1308  [0x7fff8ac74f6c]
    +                                                                     !         : | + !   : | + ! :   | 4 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]  (in CoreFoundation) + 880  [0x7fff8ac26ce0]
    +                                                                     !         : | + !   : | + ! :   |   3 CFDictionaryCreateMutable  (in CoreFoundation) + 68  [0x7fff8abd1cb4]
    +                                                                     !         : | + !   : | + ! :   |   + 3 __CFDictionaryCreateGeneric  (in CoreFoundation) + 1400  [0x7fff8abd2288]
    +                                                                     !         : | + !   : | + ! :   |   +   2 CFBasicHashCreate  (in CoreFoundation) + 127  [0x7fff8abd232f]
    +                                                                     !         : | + !   : | + ! :   |   +   ! 1 _CFRuntimeCreateInstance  (in CoreFoundation) + 400  [0x7fff8abc9310]
    +                                                                     !         : | + !   : | + ! :   |   +   ! : 1 CFAllocatorAllocate  (in CoreFoundation) + 214  [0x7fff8abc9546]
    +                                                                     !         : | + !   : | + ! :   |   +   ! 1 _CFRuntimeCreateInstance  (in CoreFoundation) + 88  [0x7fff8abc91d8]
    +                                                                     !         : | + !   : | + ! :   |   +   1 CFBasicHashCreate  (in CoreFoundation) + 668  [0x7fff8abd254c]
    +                                                                     !         : | + !   : | + ! :   |   1 CFDictionaryCreateMutable  (in CoreFoundation) + 1  [0x7fff8abd1c71]
    +                                                                     !         : | + !   : | + ! :   2 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 78  [0x7fff8ac74a9e]
    +                                                                     !         : | + !   : | + ! :   | 2 look_up_class  (in libobjc.A.dylib) + 146  [0x7fff8d0e7a0f]
    +                                                                     !         : | + !   : | + ! :   |   1 NXMapGet  (in libobjc.A.dylib) + 42  [0x7fff8d0e3ad5]
    +                                                                     !         : | + !   : | + ! :   |   + 1 _mapStrHash  (in libobjc.A.dylib) + 59  [0x7fff8d0e3bd1]
    +                                                                     !         : | + !   : | + ! :   |   1 NXMapGet  (in libobjc.A.dylib) + 61  [0x7fff8d0e3ae8]
    +                                                                     !         : | + !   : | + ! :   1 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 831  [0x7fff8ac74d8f]
    +                                                                     !         : | + !   : | + ! :   | 1 __bzero  (in libsystem_c.dylib) + 0  [0x7fff8bdf5abe]
    +                                                                     !         : | + !   : | + ! :   1 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 1257  [0x7fff8ac74f39]
    +                                                                     !         : | + !   : | + ! :   | 1 -[__NSArrayI getObjects:range:]  (in CoreFoundation) + 43  [0x7fff8ac1c39b]
    +                                                                     !         : | + !   : | + ! :   |   1 -[__NSArrayI count]  (in CoreFoundation) + 0  [0x7fff8ac122d0]
    +                                                                     !         : | + !   : | + ! :   1 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 1  [0x7fff8ac74a51]
    +                                                                     !         : | + !   : | + ! 5 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 113  [0x7fff8cd80f57]
    +                                                                     !         : | + !   : | + ! : 3 objc_msgSend_vtable9  (in libobjc.A.dylib) + 16  [0x7fff8d0e9250]
    +                                                                     !         : | + !   : | + ! : 1 CFBasicHashGetCount  (in CoreFoundation) + 8  [0x7fff8abd7598]
    +                                                                     !         : | + !   : | + ! : 1 CFDictionaryGetCount  (in CoreFoundation) + 52  [0x7fff8abdaec4]
    +                                                                     !         : | + !   : | + ! 3 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 766  [0x7fff8cd811e4]
    +                                                                     !         : | + !   : | + ! : 3 -[__NSCFDictionary setObject:forKey:]  (in CoreFoundation) + 255  [0x7fff8ac262bf]
    +                                                                     !         : | + !   : | + ! :   3 CFDictionarySetValue  (in CoreFoundation) + 252  [0x7fff8abd2a8c]
    +                                                                     !         : | + !   : | + ! :     1 CFBasicHashSetValue  (in CoreFoundation) + 179  [0x7fff8abd2b83]
    +                                                                     !         : | + !   : | + ! :     1 __CFBasicHashReplaceValue  (in CoreFoundation) + 38  [0x7fff8abfd846]
    +                                                                     !         : | + !   : | + ! :     | 1 __CFDictionaryStandardRetainValue  (in CoreFoundation) + 71  [0x7fff8abd3d27]
    +                                                                     !         : | + !   : | + ! :     |   1 _CFRetain  (in CoreFoundation) + 245  [0x7fff8abc8065]
    +                                                                     !         : | + !   : | + ! :     |     1 OSAtomicCompareAndSwap64Barrier$VARIANT$mp  (in libsystem_c.dylib) + 8  [0x7fff8be6254c]
    +                                                                     !         : | + !   : | + ! :     1 __CFBasicHashReplaceValue  (in CoreFoundation) + 1  [0x7fff8abfd821]
    +                                                                     !         : | + !   : | + ! 2 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 695  [0x7fff8cd8119d]
    +                                                                     !         : | + !   : | + ! : 1 +[NSArray array]  (in CoreFoundation) + 17  [0x7fff8ac241b1]
    +                                                                     !         : | + !   : | + ! : | 1 +[NSObject alloc]  (in CoreFoundation) + 0  [0x7fff8ac0e320]
    +                                                                     !         : | + !   : | + ! : 1 +[NSArray array]  (in CoreFoundation) + 38  [0x7fff8ac241c6]
    +                                                                     !         : | + !   : | + ! :   1 -[__NSPlaceholderArray initWithObjects:count:]  (in CoreFoundation) + 113  [0x7fff8ac12041]
    +                                                                     !         : | + !   : | + ! 1 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 75  [0x7fff8cd80f31]
    +                                                                     !         : | + !   : | + ! : 1 CFDictionaryGetValue  (in CoreFoundation) + 143  [0x7fff8abc6f4f]
    +                                                                     !         : | + !   : | + ! :   1 CFBasicHashFindBucket  (in CoreFoundation) + 1897  [0x7fff8abc76d9]
    +                                                                     !         : | + !   : | + ! :     1 __CFStringHash  (in CoreFoundation) + 724  [0x7fff8abd0e84]
    +                                                                     !         : | + !   : | + ! 1 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 146  [0x7fff8cd80f78]
    +                                                                     !         : | + !   : | + ! : 1 -[NSDictionary allValues]  (in CoreFoundation) + 373  [0x7fff8ac27195]
    +                                                                     !         : | + !   : | + ! :   1 objc_msgSend  (in libobjc.A.dylib) + 40  [0x7fff8d0e7ea8]
    +                                                                     !         : | + !   : | + ! 1 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 232  [0x7fff8cd80fce]
    +                                                                     !         : | + !   : | + ! : 1 -[__NSArrayI count]  (in CoreFoundation) + 11  [0x7fff8ac122db]
    +                                                                     !         : | + !   : | + ! 1 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 116  [0x7fff8cd80f5a]
    +                                                                     !         : | + !   : | + ! 1 objc_msgSend  (in libobjc.A.dylib) + 20  [0x7fff8d0e7e94]
    +                                                                     !         : | + !   : | + 35 +[ABMultiValueCoreDataWrapper populateIdentifiers:values:labels:primaryIdentifier:withDataFromRecord:managedO bject:property:]  (in AddressBook) + 435  [0x7fff8cd876d0]
    +                                                                     !         : | + !   : | + ! 33 +[ABMultiValueCoreDataWrapper messagingAddressesWithService:owner:withAddressBook:]  (in AddressBook) + 61  [0x7fff8cd89130]
    +                                                                     !         : | + !   : | + ! : 12 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 206  [0x7fff8cd80fb4]
    +                                                                     !         : | + !   : | + ! : | 7 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 670  [0x7fff8cd81517]
    +                                                                     !         : | + !   : | + ! : | + 6 -[NSManagedObject valueForKey:]  (in CoreData) + 61  [0x7fff938ecb9d]
    +                                                                     !         : | + !   : | + ! : | + ! 3 _PFRawIndexForKnownKey  (in CoreData) + 65  [0x7fff9388dbc1]
    +                                                                     !         : | + !   : | + ! : | + ! : 3 _PFRawFastIndexForKnownKey  (in CoreData) + 278,195  [0x7fff9388dd96,0x7fff9388dd43]
    +                                                                     !         : | + !   : | + ! : | + ! 1 _PFRawIndexForKnownKey  (in CoreData) + 194  [0x7fff9388dc42]
    +                                                                     !         : | + !   : | + ! : | + ! : 1 -[NSObject methodForSelector:]  (in CoreFoundation) + 52  [0x7fff8ac58a64]
    +                                                                     !         : | + !   : | + ! : | + ! :   1 object_getClass  (in libobjc.A.dylib) + 36  [0x7fff8d0e7b69]
    +                                                                     !         : | + !   : | + ! : | + ! 1 _PFRawIndexForKnownKey  (in CoreData) + 214  [0x7fff9388dc56]
    +                                                                     !         : | + !   : | + ! : | + ! : 1 -[__NSCFString isEqualToString:]  (in CoreFoundation) + 253  [0x7fff8ac2667d]
    +                                                                     !         : | + !   : | + ! : | + ! :   1 CFEqual  (in CoreFoundation) + 317  [0x7fff8abd4afd]
    +                                                                     !         : | + !   : | + ! : | + ! :     1 -[_PFString isEqual:]  (in CoreData) + 48  [0x7fff93886f10]
    +                                                                     !         : | + !   : | + ! : | + ! :       1 _compareUnknownStrings  (in CoreData) + 92  [0x7fff93886f8c]
    +                                                                     !         : | + !   : | + ! : | + ! :         1 CFStringGetSystemEncoding  (in CoreFoundation) + 1  [0x7fff8abe7da1]
    +                                                                     !         : | + !   : | + ! : | + ! 1 objc_msgSend  (in libobjc.A.dylib) + 40  [0x7fff8d0e7ea8]
    +                                                                     !         : | + !   : | + ! : | + 1 -[NSManagedObject valueForKey:]  (in CoreData) + 87  [0x7fff938ecbb7]
    +                                                                     !         : | + !   : | + ! : | +   1 _kvcPropertysPublicGetters  (in CoreData) + 19  [0x7fff938ecc13]
    +                                                                     !         : | + !   : | + ! : | 4 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 687  [0x7fff8cd81528]
    +                                                                     !         : | + !   : | + ! : | + 3 -[_NSFaultingMutableSet allObjects]  (in CoreData) + 52  [0x7fff938f15d4]
    +                                                                     !         : | + !   : | + ! : | + ! 3 -[NSSet allObjects]  (in CoreFoundation) + 398  [0x7fff8ac4b03e]
    +                                                                     !         : | + !   : | + ! : | + !   1 +[NSArray arrayWithObjects:count:]  (in CoreFoundation) + 26  [0x7fff8ac275ca]
    +                                                                     !         : | + !   : | + ! : | + !   : 1 _objc_rootAlloc  (in libobjc.A.dylib) + 21  [0x7fff8d0eb035]
    +                                                                     !         : | + !   : | + ! : | + !   :   1 +[NSArray allocWithZone:]  (in CoreFoundation) + 79  [0x7fff8ac0f76f]
    +                                                                     !         : | + !   : | + ! : | + !   :     1 _CFAppVersionCheckLessThan  (in CoreFoundation) + 56  [0x7fff8ac13228]
    +                                                                     !         : | + !   : | + ! : | + !   :       1 CFEqual  (in CoreFoundation) + 239  [0x7fff8abd4aaf]
    +                                                                     !         : | + !   : | + ! : | + !   1 +[NSArray arrayWithObjects:count:]  (in CoreFoundation) + 49  [0x7fff8ac275e1]
    +                                                                     !         : | + !   : | + ! : | + !   : 1 objc_msgSend  (in libobjc.A.dylib) + 40  [0x7fff8d0e7ea8]
    +                                                                     !         : | + !   : | + ! : | + !   1 -[NSObject autorelease]  (in CoreFoundation) + 5  [0x7fff8ac10585]
    +                                                                     !         : | + !   : | + ! : | + 1 -[_NSFaultingMutableSet allObjects]  (in CoreData) + 1  [0x7fff938f15a1]
    +                                                                     !         : | + !   : | + ! : | 1 -[ABCDRecord fetchPropertyValuesWithKey:uniqueId:addressBook:]  (in AddressBook) + 91  [0x7fff8cd812d4]
    +                                                                     !         : | + !   : | + ! : |   1 +[ABCDRecord entityNameForPropertyKey:]  (in AddressBook) + 25  [0x7fff8ccd0979]
    +                                                                     !         : | + !   : | + ! : |     1 objc_msgSend  (in libobjc.A.dylib) + 25  [0x7fff8d0e7e99]
    +                                                                     !         : | + !   : | + ! : 12 -[ABCDRecord propertyValuesWithKey:addressBook:]  (in AddressBook) + 726  [0x7fff8cd811bc]
    +                                                                     !         : | + !   : | + ! : | 12 +[NSDictionary dictionaryWithObjects:forKeys:]  (in CoreFoundation) + 49  [0x7fff8aca0371]
    +                                                                     !         : | + !   : | + ! : |   4 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 1308  [0x7fff8ac74f6c]
    +                                                                     !         : | + !   : | + ! : |   + 4 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]  (in CoreFoundation) + 880  [0x7fff8ac26ce0]
    +                                                                     !         : | + !   : | + ! : |   +   4 CFDictionaryCreateMutable  (in CoreFoundation) + 68  [0x7fff8abd1cb4]
    +                                                                     !         : | + !   : | + ! : |   +     3 __CFDictionaryCreateGeneric  (in CoreFoundation) + 1400  [0x7fff8abd2288]
    +                                                                     !         : | + !   : | + ! : |   +     ! 2 CFBasicHashCreate  (in CoreFoundation) + 127  [0x7fff8abd232f]
    +                                                                     !         : | + !   : | + ! : |   +     ! : 1 _CFRuntimeCreateInstance  (in CoreFoundation) + 400  [0x7fff8abc9310]
    +                                                                     !         : | + !   : | + ! : |   +     ! : | 1 malloc_zone_malloc  (in libsystem_c.dylib) + 77  [0x7fff8be6e3c8]
    +                                                                     !         : | + !   : | + ! : |   +     ! : |   1 szone_malloc_should_clear  (in libsystem_c.dylib) + 1115  [0x7fff8be3900e]
    +                                                                     !         : | + !   : | + ! : |   +     ! : |     1 tiny_malloc_from_free_list  (in libsystem_c.dylib) + 1217  [0x7fff8be387bc]
    +                                                                     !         : | + !   : | + ! : |   +     ! : 1 _CFRuntimeCreateInstance  (in CoreFoundation) + 550  [0x7fff8abc93a6]
    +                                                                     !         : | + !   : | + ! : |   +     ! 1 CFBasicHashCreate  (in CoreFoundation) + 757  [0x7fff8abd25a5]
    +                                                                     !         : | + !   : | + ! : |   +     1 __CFDictionaryCreateGeneric  (in CoreFoundation) + 241  [0x7fff8abd1e01]
    +                                                                     !         : | + !   : | + ! : |   2 -[NSDictionary initWithObjects:forKeys:]  (in CoreFoundation) + 225  [0x7fff8ac74b31]

I have the same problem. While working I can detect a major slowdown that almost brings my iMac to a halt. Activity Monitor always shows addressbooksync using 80 - 95% of CPU. I quit the process to get back to work until the next sync.
This is a major issue that will soon drive me to turn off iCloud. Unfortunately my iPhone and iPad use will suffer.
Any solutions out there?

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