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This. When optimizing realtime apps, focus on worst cases.

Also, FPS is inconvenient metric because framerate is not a linear scale. You can't say a task takes x FPS to compute, but you can say it take x milliseconds, since time is a linear scale.

For example: if a task takes 10 ms and other stuff takes 1 ms. FPS delta for the task is ~909 FPS (1000 FPS - 91 FPS). But if other stuff takes 20 ms, we get only a ~17 FPS difference (50 FPS - 33 FPS).