Comment 78 for bug 38131

I have an additional data point to add. My setup is:

 * Ubuntu 8.04
 * AMD64
 * 2.6.24-19-generic
 * Firefox 3.01 (Mozilla distribution, not Ubuntu)
 * Nvidia driver 169.12
 * Flash 10 beta

This problem manifested itself most noticeably on Facebook's new redesign (new.facebook.com):
  * During page load, both Xorg and Firefox would spike to ~50% CPU used each.
  * Once the page finished loading, Xorg would eat up ~86% of CPU time and Firefox would consume ~10%.

I downgraded to Flash 9 and marked a dramatic improvement:
  * During page load, both still hit ~50% each.
  * After page load, Xorg dropped to ~15-25% CPU, Firefox stayed at ~10%.

I understand that people have seen this problem without Flash being in the mix at all (i.e. with Java applets); nevertheless, it could help in finding the problem to see that Flash version can be a switch to toggle it on and off in a certain circumstance.

It is likely that the way Flash 10 interacts with Firefox hits a very different (buggy) codepath than the Flash 9 interaction. This theory is further supported by the new additions to Flash 10: http://labs.adobe.com/technologies/flashplayer10/releasenotes.html#features -- nearly all of these changes are related to *graphics* and would likely interface with Xorg in a different manner.