Well, I'm going to assume that you mean that the graphical version is CPU hungry. It's more cpu-intensive than the ascii version, to be sure. My laptop lags on it, but then it's a Turion 64 x2 processor, and 2gb of ddr2 ram. My gaming rig smashes through it, since it's got a Intel 3960X 6core/12thread processor clocked at 5Ghz, with 32GB of DDR3 at 2600 Mhz. I'm at work now, so I'll benchmark it on my gaming rig when I get home.