I've been having lots of trouble with windows 8.1 suddenly using creating 100% activity in the primary drive.

It slows down everything to a crawl, and I tried many known remedies, like disabling superfetch and manually increasing system memory. Doesn't seem to work.

Then I noticed that this happens whenever I download torrents larger than 8gb via vuze. I don't remember having this problem, it could be due to a recent update. Have any of you guys experienced something similar?