Comment 6 for bug 126274

Actually this seems to be something bigger...

When I watch a movie using kaffeine (no compiz or similar running) and I start Firefox (generating disk I/O) the video skips like crazy and becomes unwatchable until Firefox has finished starting.

So I think this is a problem with the I/O scheduler or the CPU scheduler.

I'm no expert on these things so I would appreciate if you could tell me ways how I can find out if this claim is actually true...

Thanks a lot for helping me figure this out.