Comment 8 for bug 614918

I have been witnessing this problem on an up-to-date Maverick.

Downloading a large .exe from firefox via downthemall to the desktop caused nautilus to try and thumbnail it. Watching top shows my RAM shooting through the roof and causes my HDD to start swapping madly, absolutely decimating my computer's response for a while. This will eventually stop but then start back up again within the next few minute.

I'd be pressed to revert this bug back to confirmed but I'd rather wait for further confirmation. There's a possible dupe report (bug 659617) that is claiming the same behavior.