I read online that flash player 10.x has bugs with its automatic (de-selectable) hardware acceleration. Instead of de-selecting this (causing poor performance) , I
opened my nvidia control panel (software varies with your graphics card) and changed its performance from "force best quality over performance" ...to... "let application decide quality and performance"
seems to be working better. In summary, your graphics card software may be conflicting with the hardware acceleration feature of flash player 10.x !!!
that may be true but we cannot expect average pc users to know how/where to do that. i am usre klaus will be able to find what it is and fix it. beta9 does not freeze, beta10 shold not either. i experienced the same things.