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The scale goes from 0 to 80. It's not horribly misleading, but just saying

I believe that’s because it’s frames per second, not an abstract percentile.

Oh, wow.

I'm an idiot

Not at all - it's a poor graph with an unlabelled axis.

While I was able to intuit the the Y axis was FPS, it's not wholly obvious. Labeling the graph (or at the very least, just that axis) would help.