I'm writing a game engine in D. Try to minimize allocations and that's will be OK. I'm using delegates and all the phobos stuff. I allocate only in few places at every frame.
So i can reach 1K fps on a complicated scene.

GC is not a problem. DMD optimizes so ugly that all the math is very, very slow.
DMD gives me about 200 fps, when with LDC i can reach 1k.

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