Joined: 6 Mar 08
I was having similar issues as Ananas described with 2.09. On my Q6600 / WinXP two tasks occupied my HDD completely, driving average CPU usage down to ~60% (with 50% of that being QMC WUs).
As far as I can tell the issue is fixed in 2.11. I think there should be a post on the news page, suggesting user to abort 2.09-WUs.