Yes it definitely would be. Every frame of run-ahead requires emulating another instance of the system. So a run-ahead of four frames means needing 5x the proce

Yes it definitely would be. Every frame of run-ahead requires emulating another instance of the system. So a run-ahead of four frames means needing 5x the processing power. Generally speaking you'd only want 1-2 frames of run-ahead, however. And in practice you can usually skip video rendering during the run-ahead frames to reduce overhead a bit.