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With an 8 MHz 6502? It's around 15 cycles per byte for memcpy, so 500KB/s of data. At 60 Hz frame rate, that's 8KB- so 64x128 for byte per pixel, or 256x256 for a bit per pixel.

The GPU supports multiple tile layers and has 128 individual sprites so updating every pixel on the screen in a single frame is unlikely to be how you use it.

This is in style of 8-bit machines that had hardware sprite support and tiles graphics rather than treating the display as a flat framebuffer.

Sure. It's just nice to know what the limitations are in that regard. Some demos for the Atari 8 bit machines for example did use them that way by lowering the resolution sufficiently far and then writing really tight assembly language. So I was just interested in comparing on that basis.

Me too, I love plasmas.