Comment 4 for bug 737454

Hi guys,

More details on this issue. I have done some tests.

I have recorded a video for you to see the problem.
http://www.youtube.com/watch?v=eIEbPioVGo4

recordmydesktop caused high load on cpu but doesn't effect xorg. Don't blame it please:) The same story if I don't run recordmydesktop. There were running 11 terminals. There are no any other applications running.
Make sure to set the guilty to HD to see the numbers.

A few more things I can added:

1) This issue happens when I have __an external monitor attached___ (1920*1080 Twin or separate X mode). Checked without the external monitor, didn't see the high load on xorg by running the same test I made in the video.

2) I found that on idle doing nothing with those 11 terminals the xorg load goes down. But ACTIVITY brings the load back. (just running top command and refreshing it)

3) The problem is even worse when I have firefox and other application and doing something. Everything is laggy and not smoothly.

4) Using the external monitor but without compiz the performance is great.

So my concluding on this issue:
using compiz and an external monitor attached cause high load on xorg.

Probably compiz doesn't handle well large resolutions and external monitors? in my case it is with nvidia drives.