I'm downloading torrent with StackExchange data dump. There was about 40% done, today when I clicked resume, the computer hanged and was practically unusable for about 30 minutes.
After a few minutes process explorer opened and I've found out that the memory consumption was at the level 95% (from 3GB), which was an explanation why processing every click takes so long. However, though I've displayed all processes, I wasn't able to find anyone who was using so much memory. The Opera itself was using about 150MB. Avast was almost invisible when it goes to memory usage and CPU consumption.
My machine has 3GB RAM and Windows7 64 bit installed. The antivirus is Avast. The data dump has about 11GB.
What process could cause so much memory usage in torrent files check phase? This process was invisible in show-processes-of-all-users mode.