title: ImageGrab.grab() method is too slow
body: <p>So i need to get a bunch of screenshots every second, like 5. I am using it to program a bot for a game. However imagegrab method takes like 0.3 seconds, which is terribly slow for me. Even after specifying the bbox values it still takes like 0.3 seconds. I think should mention that I am on a mac. Is there a better way for me</p>
  
  <p>I even tried the <code>os.system("screencapture filename.png")</code> which has a runtime of 0.15-0.2 seconds which is nice but I want to go faster.</p>