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> but if one frame took 0.1s and the others took the rest, then for users it'll feel like the game plays at 10fps at that point

Wouldn't it feel like 10fps for 0.1s only? I agree it's a good thing to measure, I think it's called "stutter" usually, but I'm not sure you can say "it feels like 10 fps" since its for such a small moment.

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Yes, you are right. The word I was looking for is smoothness: the game won't feel like a stable 10fps, but it would feel as _smooth_ as a 10fps game, or even worse actually, because it's less predictable, and our brains can adapt to stable latency relatively well
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Right, if that happens every 5 second or whatever, you'd feel intermittent stutters basically, but again, it wouldn't really "feel like a 10fps game", because those render 10 frames per second, not "X frames per second and every Y seconds, a 0.1s frame", a game like that would just feel "stuttery", at least from my perspective, not "like a 10fps game".
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