[QUOTE=Mucaro] yoyo's Game Maker? i import some games from game maker like the doom style demo, but only import the graphics. but i want to see how the performance works.[/QUOTE]
for C2 and 2.5d, this link might help you link
regarding the performances, I believe it's too early to develop fps or complex 2.5d games, still browsers improving and webgl capacity only visible on new desktops/devices.