Browser performance issues caused by Flash?

I’ve been having issues in the last weeks where my CPU would peg at 100%. This is typically caused by a web page with an embedded Flash object (e.g. an ad or a music player). Closing the respective tab brings the CPU back to normal. This happens to me on Firefox 2, IE6, Safari 3.1 and SeaMonkey 1.1.9.

I’m running Flash 9,0,115,0. I will try upgrading to the latest version and see if this improves anything.

It’s not the first time that I see a third party component hurting performance and stability of the browser. I wonder how many extension the Mashable guys are running and how those impact the stability of Firefox. Disable/remove all extensions for a few days and see if the browser still crashes as often.

Also see “Firebug and Yahoo! Mail“.