So I've got a Macintosh Mini (mid-2010)—believe it or not, that's the official name—running "Snow Leopard" OSX 10.6.8. I synchronized a lot of data on that with a Galaxy Player 4.0 "YP-G1" (which I refer to as a "Palm Pilot" since it's shorter than saying "technically it's an MP3 player and not a smart phone", and since it replaced my Palm Vx which was in service for about 10 years.) I got frustrated with MissingSync for Android when it started flaking out and not connecting to the Palm Pilot anymore. I switched to SyncMate which I was very excited about (since, unlike MissingSync, it let me synchronize while charging.)
I started noticing that iCal was running slowly. Whenever I changed to a different day it would take around 4 seconds or so. I searched around and found iCal Dupe Deleter. It exports a backup for you in iCal then looks for duplicates and deletes them. Upon completion, you restore the fixed backup into iCal—a process which I assume replaces all your iCal data with the archive contents. I had 3 or 4 duplicates, but now iCal is (while not snappy) reasonably quick in switching between days. I only wonder if I simply created an archive in iCal with File > Export... > iCal Archive... then immediately restore it with File > Import... > Import... and picking the file I just created.
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