Browsers can attempt to improve Javascript performance because it's an open standard. And 2d rendering performance, and 3d rendering performance, and whatever e

Browsers can attempt to improve Javascript performance because it's an open standard. And 2d rendering performance, and 3d rendering performance, and whatever else. The only people who could improve the Flash plugin's performance were the people at Adobe working on it. And, well, Adobe just doesn't give two shits about performance of any of their tools unless they absolutely have to.