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It could, in theory. More vertices means more memory used on the GPU. If your game uses enough GPU memory to trigger swapping, then you could lose a bit of time to memory transfer. However, if w and h are low, then the buffer will use a negligible amount of memory, and if w and h are high then the wasted memory is fairly small. (As an example, the overhead on a 64x64 grid is about 3%.) The chance that a useful buffer could fit in that additional space is pretty small. The chance that you'd notice the FPS difference there is pretty tiny.