Visual Studio 2012 uses 100% of a CPU core

I suffered from the following problem after I upgraded Visual Studio from 2010 to 2012. One thread in devenv.exe suddenly became out of control and keep consuming 100% of a CPU core in spite of doing nothing. This often caused in 20-30 minutes after devenv.exe started running.

I looked for the way to solve it and found someone said its cause is ReSharper. I tried uninstalling ReSharper, but it couldn't solve the problem.

I found Quick Launch wasn't linked with the problem, sigh... After I tried various settings, I found disabling Quick Launch solved the problem. In spite of this setting, devenv.exe sometimes consumes 100% of a CPU core but it calms down after a while.