Instant transfer of heat is easier said than done. Even if heat traveled at one pixel per second (which is the speed of light in most simulations), it wouldn't be fast enough to measure in with other things around it. It technically already does travel this fast for most elements besides for foam (which doesn't exist at the moment.)

And to make heat calculate pixels around itself for every pixel active on the screen @_@


I dunno though, it could probably be done. I don't know the coding side of this @_@