Also if you are using x64 mozilla firefox 4.0 beta 6 or newer x64 flash may become handy!The key new capabilities in the Flash Player "Square" Preview Release are:
64-bit support — Native support for 64-bit operating systems and 64-bit web browsers on Linux, Mac OS, and Windows.
Internet Explorer 9 hardware accelerated rendering support — Enhanced support for Internet Explorer 9 Beta. It takes advantage of hardware accelerated graphics in Internet Explorer 9 Beta, utilizing hardware rendering surfaces to improve graphics performance and enable seamless composition.
I also noticed performance boost.
Get it here:
Adobe Labs - Downloads: Flash Player "Square" Preview Release
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