On an underpowered G5 iMac running OS X 10.4, I spent a lot of time troubleshooting performance issues. One of them was the "spinning beachball" effect, where some process would take over for a moment, resulting in everything else hanging until it released some CPU.
On at least one of these instances, launching Activity Monitor showed that Sync Server was taking up 100% of the CPU every few minutes.
Apparently this is a common problem on both 10.4 and 10.5:
SyncServer Problem Post on Mac Forums
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Posted by ellen at February 13, 2008 09:10 PM
OS X 10.5, SyncServer takes 100% of CPU
This article suggested resetting Sync Services, following the instructions in this Apple Technote:
Open Terminal and paste in the following command, then press Return:/System/Library/Frameworks/SyncServices.framework/Versions/A/Resources/resetsync.pl full
For more information:
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