If an engine puts in a hard 60fps cap, it tries to have a new frame ready for each 60Hz screen refresh, and often other parts of the engine 'slow down' so that the frames don't finish too early, physics and netcode don't get messed up, etc. That's a reason to prefer much higher frame rate caps. Micro stutter occurs when the frame rate fluctuates just enough that you might average 60fps, but some frames come a bit early and others come a bit late. If it's not, the display shows the same frame as the previous update, giving you 30fps, and if a new frame is ready you get 60fps. With a 60Hz monitor, the screen updates every 1/60 of a second, and either a new frame is available in time or it's not. Back in 2013, AMD discovered some driver optimizations that could help reduce microstutter.
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