Actually the Flash version is done by drawing at a pixel level too (although some of the filter effects are indeed done by the player). The source is here: http

Actually the Flash version is done by drawing at a pixel level too (although some of the filter effects are indeed done by the player). The source is here: http://code.google.com/p/in-spirit/source/browse/#svn/trunk/projects/FluidSolver/src http://code.google.com/p/in-spirit/source/browse/#svn/trunk/... From my experiences with canvas it seems the calling the drawing methods is the major bottleneck for this sort of thing. Minus the visuals I would guess the JS on V8 would run comparably to the AS3.