Algodoo

There is no point to generate so many boxes, because color is 8bit per color (256 levels). That means most of that boxes displayed same as nearest.

Neither of us have lag xD
It doesn't lag, but it generates boxes very slowly. With a horrible videocard, I've got 144 FPS in my comp (AMD HD3000 and 6 cores @ 3.5 GHz). You can fix that if you rewrite the code so that it stops spawning boxes when it detects that it's on red again, then put this at 40 Hz or less to make it spawn less boxes because as Kilinich says, it's unnecessary, and ya
I'm rating this right now

Try
_Timer = sim.time * 4
and
colorHSVA := [sim.time * 35, 1, 1, 1]