I've used this to track down my scrolling performance problems in the past, although it's been a while: https://github.com/nielsbot/Profiler https://github.com/

I've used this to track down my scrolling performance problems in the past, although it's been a while: https://github.com/nielsbot/Profiler https://github.com/nielsbot/Profiler (yes, I'm plugging my own code :-)