FSEVENTSD using 90-100% CPU after updating to 10.6.4

My iMac, previously running fine, is now running very slow. After reading some things here and elsewhere, I tried shutting down Spotlight indexing using Terminal (don't recall exactly what I did). That did kill Spotlight but I am still having the problem. I also reinstalled Snow Leopard from my original retail disc and then did the combo update. Still no good. I bring up Activity Monitor and FSEVENTSD is constantly running at 90-100%. This has persisted for a few days now. FYI, I do have both Firewire and USB 2 drives connected. I did seem to notice that the problem may have started when I reconnected the Firewire drive after doing the reinstall. It may have been a coincidence though.
Please help. This is killing my productivity since even my mouse is running slow.

See:
Mac Maintenance Quick Assist,
Mac OS X speed FAQ,
Speeding up Macs,
Macintosh OS X Routine Maintenance
Essential Mac Maintenance: Get set up,
Essential Mac Maintenance: Rev up your routines,
Maintaining OS X, and
Myths of required versus not required maintenance for Mac OS X for starters.

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+ " SkyDrivePro1 (ErrorConflict)" "Microsoft OneDrive for Business Extensions" "Microsoft Corporation" "c:\program files\microsoft office 15\root\vfs\programfilesx64\microsoft office\office15\grooveex.dll" "12.11.2014 01:13"
+ "{C52AF81D-F7A0-4AAB-8E87-F80A60CCD396}" "" "Apache Software Foundation" "c:\program files (x86)\openoffice 4\program\shlxthdl\shlxthdl.dll" "20.09.2013 12:50"
+ "{C52AF81D-F7A0-4AAB-8E87-F80A60CCD396}" "" "Apache Software Foundation" "c:\program files (x86)\openoffice 4\program\shlxthdl\shlxthdl_x64.dll" "20.09.2013 12:41"
+ "7-Zip" "7-Zip Shell Extension" "Igor Pavlov" "c:\program files\7-zip\7-zip32.dll" "18.04.2011 19:34"
+ "7-Zip" "7-Zip Shell Extension" "Igor Pavlov" "c:\program files\7-zip\7-zip.dll" "18.04.2011 19:35"
+ "ANotepad++64" "ShellHandler for Notepad++ (64 bit)" "" "c:\program files (x86)\notepad++\nppshell_06.dll" "12.05.2014 10:49"
+ "Ath_CopyHook" "Bluetooth File Transfer Plugin" "Qualcomm®Atheros®" "c:\program files (x86)\bluetooth suite\folderviewimpl.dll" "25.09.2013 10:58"
+ "Atheros" "Atheros Bluetooth Module" "Qualcomm®Atheros®" "c:\program files (x86)\bluetooth suite\btvappext.dll" "25.09.2013 10:58"
+ "DropboxExt" "Dropbox Shell Extension" "Dropbox, Inc." "c:\users\david\appdata\roaming\dropbox\bin\dropboxext64.24.dll" "24.06.2014 01:32"
+ "DropboxExt1" "Dropbox Shell Extension" "Dropbox, Inc." "c:\users\david\appdata\roaming\dropbox\bin\dropboxext.24.dll" "24.06.2014 01:31"
+ "FTShellContext" "Atheros Bluetooth Module" "Qualcomm®Atheros®" "c:\program files (x86)\bluetooth suite\shellcontextext.dll" "25.09.2013 10:58"
+ "GDContextMenu" "Google Drive shell extension" "Google" "c:\program files (x86)\google\drive\contextmenu64.dll" "16.01.2015 01:57"
+ "GDriveBlacklistedOverlay" "Google Drive shell extension" "Google" "c:\program files (x86)\google\drive\googledrivesync64.dll" "16.01.2015 01:56"
+ "igfxcui" "igfxpph Module" "Intel Corporation" "c:\windows\system32\igfxpph.dll" "09.09.2013 18:26"
+ "LockHunterShellExt" "LockHunter Explorer Extension" "Crystal Rich Ltd" "c:\program files\lockhunter\lhshellext32.dll" "25.03.2009 08:53"
+ "LockHunterShellExt" "LockHunter Explorer Extension" "Crystal Rich Ltd" "c:\program files\lockhunter\lhshellext64.dll" "28.04.2009 10:21"
+ "PDF Shell Extension" "PDF Shell Extension" "Adobe Systems, Inc." "c:\program files (x86)\common files\adobe\acrobat\activex\pdfshell.dll" "11.05.2013 10:34"
+ "PushbulletCtx" "" "" "File not found: :/Program Files (x86)/Pushbullet/pushbullet_ctx.DLL" ""
+ "RecuvaShellExt" "Recuva shell extensions" "Piriform Ltd" "c:\program files\recuva\recuvashell64.dll" "14.03.2014 12:41"
+ "SD360" "360 Total Security" "" "c:\program files (x86)\360\total security\menuex64.dll" "12.01.2015 03:55"
+ "SourceGearDiffMergeShellExtension32" "SourceGear DiffMerge ShellExtension 32" "SourceGear LLC" "c:\program files (x86)\sourcegear\common\diffmerge\sourcegeardiffmergeshellextension32.dll" "23.10.2013 19:15"
+ "SourceGearDiffMergeShellExtension64" "SourceGear DiffMerge ShellExtension 64" "SourceGear LLC" "c:\program files\sourcegear\common\diffmerge\sourcegeardiffmergeshellextension64.dll" "23.10.2013 19:17"
+ "StartMenuExt" "Start Menu Helper Extension" "IvoSoft" "c:\windows\syswow64\startmenuhelper32.dll" "20.04.2014 18:17"
+ "StartMenuExt" "Start Menu Helper Extension" "IvoSoft" "c:\windows\system32\startmenuhelper64.dll" "20.04.2014 18:16"
+ "WinRAR32" "WinRAR shell extension" "Alexander Roshal" "c:\program files\winrar\rarext32.dll" "02.12.2014 11:07"
+ "WinRAR" "WinRAR shell extension" "Alexander Roshal" "c:\program files\winrar\rarext.dll" "02.12.2014 11:07"
+ "WinSCPCopyHook" "Drag&Drop shell extension for WinSCP (64-bit)" "Martin Prikryl" "c:\program files (x86)\winscp\dragext64.dll" "14.08.2013 12:22"
I you have any clue what might be going, I would be very happy to hear it. It's really annoying, as I have to kill explorer.exe and thereby close all my folder windows when this happens.
Thank you!
Best regards,
David Trapp

Hello,
thanks for having a look. However, I already ran SFC before posting on this forum (as part of my own investigation) and it came back clean. RescueTime (a time tracking tool) is probably not the culprit because it happened also several times in the past without
RescueTime being running (that was because I had accidentally removed it from autorun at that time).
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(note that there is only one "d"), so I assume its job is just to invalidate (and in turn, refresh) the cached information about nodes in the left pane's folder tree of the explorer window(s) - since the folder tree is the only NamespaceTreeControl
(whose corresponding class name is CNscTree) in explorer folder view windows. As I see it, something is causing explorer to repeatedly refresh the folder tree data, but I am stuck at finding out what exactly.
Best regards,
David Trapp
EDIT: Disassembling ExplorerFrame!CNscTree::_TreeInvalidateItemInfo confirms that, because it seems to call TreeView_SetItem for a tree node and its parent (possibly with all fields set to *_CALLBACK), and CNscTree::_UpdateItemDisplayInfo
for the parent node.
EDIT2: I'd love to dig more into the trace, however I am hitting a wall at function names/addresses. Everywhere where I would expect a function name/address (such as the "by stack" views), I only see question marks instead. What
could be the reason?

FSEVENTSD using 90-100% CPU after updating to 10.6.4

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