I have been using IntelliJ 10CE for the past week. I am on a Core 2 Dueo 2.0GHz Macbook, with 4GB of RAM. I notice that IntelliJ IDEA is constantly using 3 to 4 percent CPU event when it is hiddgen/minimized, and I haven't used it in hours. Activity Monitor tells me that there is lots of memory left, so it is not swapping. It is using 47 threads, and is running in 32 bit mode. I have disabled many plugs, that I am unlikely to use. I am just using Hg for source control, so I don't think it is something to to with a VCS plugin bug.
yeah 3~4% isn't a huge, deal, but nothing else does that (second highest would be netbeans at around 1%), and if I am not doing anything with the code, what is it spending those cycles on? It eats up laptop battery too. And yes, Power Save mode, does not change anything, still uses the CPU when idle.
Is this a known problem? Google didn't turn up much.