# When a game runs too fast or too slow

While playing, press `Cmd ⌘`+`I` to bring up the CPU Inspector and adjust the CPU speed slider until the game runs at a suitable speed.

If your game still runs too slow even at maximum speed, enable “Optimize for newer games.”

If you have an older Mac, then raising the speed too high may result in worse performance and stuttering sound (as your Mac is unable to keep up with the demands of the emulation.)

In this case, lower the frame rate slider instead.