Q: Running Out of Memory Since Yosemite

I had the same issue on my computer.   I'm also noticing that there is less room to grab the window of apps to move the window around.  Otherwise, it's pretty trouble free so far, but the memory issue still needs to be dealt with pronto.

Same issue here, iMac Late 2009, 8 GB RAM. As an (unsatisfactory) workaround, I just don't run Mail unless I have to send a message, then quit it right afterward. Otherwise, everything bogs down and becomes unusable.

I experienced this problem today. I have no unusual background apps running, i pretty much just use Pages, the browser, Evernote and Spotify. And Mail. I didn't have this problem before I upgraded to Yosemite. Not once.

Do you think that this is a mail app problem ?

Otherwise I'm going to have to figure out how to go back to Mavericks pronto.

I'm having the identical problem....I was a beta user as well, submitted 12 tickets on the issue without a response.

I've seem to have isolated the issue....whenever I'm using MAIL, specifically drafting a new email, I can watch my memory cycle down to 0 in 45 secs.

let me know if you find a solution....I'm about to dump yosemite and reinstall Mavericks....

I am having the same problem. Mail will run fine for awhile then suddenly the memory spike and it says its paused. Going to Activity monitor shows the high memory allocation.

What's the deal?

I'm having the exact same issue, on both a  2013 MacBook Air, and on a 2009 iMac. I've used activity monitor, and can observe the mail app increasing in memory usage from 200mb during normal conditions to a sudden rise to 60+GB. Same activity monitor screens as in this post. If I force quite the mail app, everything returns to normal, but this happens at least once every hour.  So my assumption is that 1) yes it is the mail.app, 2) it's happening to quite a few people, 3) it's happening on a range of recent as well as older machines, 4) it was introduced with Yosemite, 5) it's not a "plugin" as someone suggested in other posts, 6) no help from clearing cache, clean installs, deleting preferences or container folders in the library.

I would lIke to think Apple will address this issue, but find it alarming that someone in this thread has raised 12 tickets about it in beta without receiving a response. For those of us affected, we might be in for a long wait.

Apple, please help!

I haven't gotten the error, but I'm having a similar issue with Mail since installing Yosemite Beta 2.  I bought new RAM, to no avail. Swapped slots. That didn't help either. Menu Meters shows the memory dropping to 3GB, yet Activity Monitor shows 8GB installed. Maddening.

Finally, tonight, I saw that Mail was the runaway app. It said it was using 45GB of memory.  I don't even know how that's possible.  I have 8GB installed and 35GB free on my drive.

BTW, this is on a mid-2009 13" MBP.

I am having the same issue. Lost 8 gigs of memory after Yosemite. Also killed my WD Passport 1T back up hard drive. Guess I got out ok. When upgraded to Mavericks I had to buy the Passport and a new printer because Mavericks killed by absence of drivers from HP or Mac and that iOmega drive was no longer recognized. If anyone has a solution please share. If anyone wants to say how they never have problems please do not. If a Mac shill wants to say the problem is me not the upgrade please do not.

Just any solutions, please. I tried reformatting the Passport but now it will not mount even though it is recognized in Disc Utility. Running any of the programs on DU is met with "cannot mount disc". I would like for Apple to pay me $300 for the equipment I have had to buy for the last 2 upgrades that were killed by the upgrades, don't pass it off on HP or WD, accept the blame, you did it Apple,  you laid the costs on your loyal customers.

Seems to be a problem a lot of people are having. We will just have to wait until they release an update to fix it.

You did a clean install with no old data at all or you imported some data. What data?

Yes, its clearly a Mail App problem.  Suck.