Remember that Snes screen is 256x256 pixels, that is 65536 bytes to handle.Why don't make normal PC games using the same technics
That is the size of just ONE sprite in modern games!
Even if Snes had many layers and transparencies, we are just talking about a bunch of pixels...
Do you remember the times when all PC games where 320x200 VGA? Do you remember Doom?
320 * 200 = 64000 pixels ... about like the Snes and those games were running with a 286 processor... And Doom was really fast too!
Now the tipical resolution 1024 * 768 = 786432 pixels...