well the point of flash is to deliver multimedia content to browsers without significant bandwidth overhead, which it does an OK job with, but it's not perfect.
there will be some slow-age that will take place.
In the 10.1 release of Flash Player, things have been significantly optimized for mobile devices to ensure it performs well. It even knows things like if the particular flash content is actually off screen (i.e. on the bottom of the page you have not scrolled to yet) and won't waste CPU cycles playing it unless you scroll down.
It also has full gesture and touch support so there will be some really great interaction on the droid.
^^^ that sounds pretty sweet. i'm really excited for flash. it will pretty much complete my DROID experience.