Mavericks Upgrade Experience – Apps keep freezing

So I, like a zillion other Apple fanbois, updated to Mavericks yesterday. Yay for free upgrades.

Overall, I’m impressed. It feels faster, I love the proper support for multiple monitors, iBooks on the desktop is a win, and the iCloud keychain works as advertised, with syncing to my phone.

But there’s one big negative – I’ve had multiple episodes of “applications randomly freezing”. When this occurs, the application _that I’m currently using_ just stops. It doesn’t crash, it just pauses. For a few seconds, or a few minutes, then it resumes. I can go use other apps, and they’ll work – or they might pause as well. It’s only been a day, but I’ve had 4 of these episodes so far – once last night shortly after upgrading, which I kind of shrugged off, and then 3 this afternoon, in about a 2 hour period. (Worked fine all morning though).

If I had to guess, I’d say it’s the new memory compression feature – but I had it occur just after a reboot this afternoon, with no other apps open. Then this evening it’s working fine again.

The other likely explanation is a clash with 3rd-party apps – I don’t run that many, but you never know.

In any case, I’m going to be doing a clean install to an external disk to see if it reproduces there – if it doesn’t happen there, then it will be a clean install for the laptop as well this weekend.

If you’ve had issues like that, feel free to leave a comment.

Update: Well, it just happened again. The only observation I can make is that it was while doing a build for the project I’m looking at – it’s quite possible that it was trying to compact memory or move stuff to swap. I wonder if the swap partition is corrupted?

Update the second: As it turns out, my hard disk had started reporting SMART errors the day before I download Mavericks. Bad timing. The freezes were being caused by I/O errors – sure enough, when reading from the swap file (not partition).