Some parts can, some not, some are better in HTML5 / WebGL, some are better in Flash / Molehill. GPU bottlenecked things should be more or less similar, CPU bo

Some parts can, some not, some are better in HTML5 / WebGL, some are better in Flash / Molehill. GPU bottlenecked things should be more or less similar, CPU bottlenecked things are currently faster in Flash. Flash has more troubles integrating with the rest of the browser stack (DOM layers compositing). According to sparse info so far, Molehill will be limited by DirectX 9 capabilities, which is also the case for WebGL with ANGLE rendering backend on Windows but not for WebGL with OpenGL rendering backend on Windows / Linux / OSX (these should have capabilities of OpenGL ES 2.0). Which means if you have a high-end graphics card, you should be able to squeeze out more from it with WebGL. Also work-in-progress are WebGL extensions, which will expose even more GPU capabilities.