I saw an email just like this like week and made a switch to chromium. There is a difference. Especially when opening a new window, Firefox has some very large spikes. Don't use Thunderbird so I cannot say anything about that. On Aug 8, 2012 6:30 AM, "Thaddeus Nielsen" <thaddeus.nielsen@xxxxxx> wrote: > On Wed, 08 Aug 2012 07:34:14 -0500 > "David C. Rankin" <drankinatty@xxxxxxxxxxxxxxxxxx> wrote: > > > Guys, > > > > I have watched this in top for the past week or so. Thunderbird > > and Firefox are causing X cpu usage to shoot upt to between 80-100% > > on simple tasks like scrolling a message list in tbird or simply > > opening css menus in firefox. All of this used to be instantaneous > > and never cause the cpu to bat an eye. But now, it is very pronounced > > and brings the desktop to a crawl. This box is not a screamer, but > > plenty fast, P4 2800/4G/Nvidia 8600GT. > > > > How do I determine what is causing this? X? ff/tb? something > > else? Any ideas appreciated. Thanks. > > > > My suggestion: remove firefox and install firefox from mozilla.com. > When a similar experience occurred for me, I did that and found that > the response was much better in the version from mozilla.com. > > T. >