I can't see my MS and FPS

Normally I always check my ms and fps to see if it's safe to go in or if I need to play more passive and of course to signal my team when I'm lagging, but for a while now I can't see it and it's very annoying. I am still able to win games, but surprise lag spikes are a lot more dangerous now... I've already tried to reinstall the game, but it didn't fix it. Has anyone experienced this before? How do I fix this? I'm playing on a mac by the way.
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