Still no solution? I am crying at my computer these days :-/ My MBP 13" 2011 is slowing down like **** after something randomly happens. There is no free memory, that is the problem. But no idea what causes it... This reminds me of the times we used to reboot Windows machine frequently due to the same problem ... Seems like Apple is going backwards :-(
I'm going to weigh in here too and say this issue is driving me nuts. It's preventing me from working most days and I've tried everything to fix it, but alas, no.
I don't have the time to reisntall OS X and redownload and reindex all my Dropbox again. I haven't had to reinstall OSX because of a bug since Power PC days and I'm quite annoyed.
I've had the same issue and spent an afternoon trying to remedy it with an Apple Genius to no avail. The only solution I've found is to not use the new Messenger or Ichat, but use Adium instead. When imagent does load, I useactivity monitor to kill it as rapidly as I can, which usually takes up to 6 times, before it finally settles down. Upon reboot, providing I am not using iChat or Messenger, it does not reappear 99 out of 100 times. On the rare occasion that it does, I follow the same procedure.
It is a nightmare and a disappointment from Apple. I did file a support ticket through the Genius to make sure the developers were aware of it in hopes it would be remedied quickly, but so far crickets.
This is clearly something to do with message and facetime. What worked for me is right clicking on messages in the dock and setting it to offline and then starting it and logging in. The other thing is I never had any problems with Messages until I logged in with my apple id the other day. Try removing your accounts and adding them back one at a time.
Ok. I think I solved this. It was happening on both my macs. It seemed when I was signed in with iMessages using my Apple ID and signed in with AIM at the same time then this was coorelated with the problem for me. Disabling the AIM account seems to have fixed it, or if you have to use AIM then sign out of the iMessages account. There might be other combinations of sign ins that lead to the issue, I'm not sure. But this worked for me. Everything was fine until I signed in with iMessages account. That's when I started having issues. I was able to run the iMessages on its own, or with Jabber/google, but not with AIM.
Same problem here. MBA 2012. Runnning Gtalk, AIM and iMessages.
Insanely frustrating problem. Started about a month ago.
Also, perhaps unrelated, AIM started failing for me around the same time. I had to update the config to NOT use SSL to get it functioning again.
I hope Mavericks gives some love to Messages. This app is suffering.
Sorry I missed this one.
The iMac I use every day came with Lion on it and I tried the Messages Beta.
Also the Mac User Account was in fact Migrated from Leopard (iChat 4.x.x)
That particular iChat had the Chax Add-on installed and therefore had references to that Add-on in the com.apple.ichat.plist
This would have had the potential to disrupt Messages when I updated to Mountain Lion. (I bought the Core 2 Duo iMac quite late in Lion's cycle and did not use iChat 6 that much).
I have removed the .plist and restarted the Messages beta fairly early on to exclude things like this.
As has been said the IMAgent app is used by both FaceTime and Messages.
As FaceTime can be turned Off I would use that as a diagnostic tool if possible.
An Alternative would be to Disable the accounts in Messages in turn.
I have an AIM registered name, two @mac.com names, And @me.com name and an @icloud.com name logged in to AIM as well as the Linked Apple ID being logged in to iMessages.
In Addition I have an Yahoo account, a GoogleTalk none and another Jabber account also logged in but do not have this issue.
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.4)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously
I can confirm that I am now seeing this on 10.8.5 and my computer stopped working while we were watching a movie.
I saw the imagent thing the next time I restarted - up to 8 Gigs of memory (how is this acceptable???) and indeed, I was using AIM account with Messages for the first time.
While that was happening, an iChat I had on the phone with my daughter synced to my computer. I believe some time recently I configured imessages to sync to other devices, but I couldn't tell you where or how I did that.
I hope this doesn't continue to plague my system. After all, I only have 8 cores and 16 Gb of memory. Not really enough to run OS X.