Contacts app is very very slow; why?

With my Z1, searching for contacts was very fast. It was real-time as I type the characters.
With my Z2, it is unacceptably slow. It can be a few minutes to search for contacts. Even when I go to Favouites where I have only eight contacts, the page takes a while to load. When I go to Contacts and search for a contact it can take a few minutes for the contact to be found. Then, when I select that contact, it can take a few minutes again to display the content.
Why is that?
Yes, I have many contacts (maybe 4,000+) and many are duplicates linked from Exchange and LinkedIn. But even when I turn off Auto-Sync, it can still be unacceptably slow.
And I don't keep many apps open at the same time.
What are the possible things I can try?
Thanks,
CWL88

I'm afraid it's not possible to disable the online search. Even if you disable synchronization of contacts it will still search against the server. I will forward this as feedback internally but currently you would need to remove the ActiveSync account to stop online search. A workaround may be to use another client instead like Moxier, RoadSync or Nitrodesk.
The more contacts you have the longer it will take to load all contacts if it's no longer stored in RAM. You can force contacts to stay in RAM but to avoid it being closed, close other apps when you're not using them by pressing the lower right icon and swipe them away. But Z2 has 3GB RAM so usually this is not needed but it depends on what other apps you have any how much RAM they use.
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Phone and contacts app freezes, becomes slow and scrolling is jittery

My setup:
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I don't have 3G on my CIM (provider BASE.BE), I can only use WiFi to connect to internet.
I sync my gmail contact (mail and calendar are turned off) through the iPhone built in Exchange account connector.
Fetch new data is off, push is off, fetch set to manually, advanced schedule set to manual.
I only turn WiFi on once a day, when I'm home, sync contacts and then I turn WiFi off again.
Spotlight search is turned off.
Device runs fine, battery life is great (much better than my iPhone 3Gs), I have about 2700 contacts, no duplicates, updates in both directions, everything working perfectly.
Then without any warning, or even without any use of the phone, this happens:
1) The phone and contacts app becomes unresponsive for a few seconds, remains very slow, scrolling becomes jittery or freezes. When the symptom occurs both apps have this issue. I assume because both use contacts. Both apps don't crash, they just get very slow as if they were trying to do something heavy. This does not happen with any particular event, like getting a call or text message. This can happen even at night without any missed calls or text messages send or received. The symptom does not affect any other app. For example when I open the iPod app, scrolling though the long list of music is fast, without any freezing or jittery behavior, while the Phone and Contacts app is still very slow. The problem does not go away by itself. Hard rebooting the phone does not help. I assume the problem is not related to any purchased apps because this can happen when none of them are running.
2) The phone gets really hot.
3) The battery drains very fast. I can go from 100% to 0% in under 30 minutes.
4) CPU usage (use System App to measure) goes from < 20% to >75% or more.
I notice the symptom mostly when in the 1) phone app, or 2) I feel the phone heat up or 3) in the morning when the phone battery is almost empty when it was full the night before.
I can fix the problem by 1) turning on WiFi, opening the contacts app. Then I see the circular indicator in the top left hand corner turning round. This takes just a few seconds, to sync 1 or 2 contacts en when the indicator disappears, the problem is gone. Scrolling is fast again. Problem fixed. It can take a day or two and the problem comes back. Do sync trick again and problem gone again, and so on...
I can also fix the issue by 2) deleting my gmail exchange account, putting it back and syncing everything back. But like with solution 1) the problem will just returns after a few days.
I have even tried a full factory reset and manually putting all my apps back. But again, when I import my gmail contacts, wait a few days and problem returns.
I've been having this issue for a few months now and have done quit some research on the subject. I'm pretty sure I also had the issue on iOS 4.1 and possibly also 4.0. I did not have the issue in iOS3. I had the same problem on my iPhone 3Gs which Apple replaced. I thought the battery was dying. Now I bought an iPhone 4, same problem.
I purchased many system monitor apps to find out what process was causing the problem. The problem is that none of the apps I found report CPU or memory consumption per individual process. So I only know CPU goes from below 20 to 75% and more, but I can't pinpoint which app or process is doing the extra consumption. But it has to be one the standard built in iOS processes. I can see when what process started. And when the issue happens, I can hard reset and don't launch anything, and the problem is still there.
When iPhone apps crash and you connect your phone via iTunes the crash reports are put on your computer. I found these logs but because the contact and phone app don't crash I have found nothing interesting there.
I have not found a way to trigger the problem on purpose. I tried adding, changing deleting contact on my iPhone, none of these actions trigger the issue. The problem just appears at random.
I have also not found a way NOT to have the issue. I've tried not changing any contacts for a few days, but the problem still creeps up.
I have read dozens of threads on the internet and only this one comes close:
http://www.google.com/support/forum/p/Google%20Mobile/thread?tid=62b2355d61d8e11 c&hl=en
I also found this interesting:
http://discussions.apple.com/thread.jspa?threadID=2567976
<Edited by Host>

I solved this problem by restoring my phone to factory setting. I dint find any solution to this problem. Now instead of using "Google Sync" i use iTunes contact sync which does the same thing.
The key is not to use "Google Sync" when you restore your iPhone. Follow these steps:
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