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This only happens when using one of the windowed modes, correct? The frame limiter works as intended with Fullscreen mode? Does this only happen with the in-game limiter? Have you tried an alternative one?

Can you submit a Final Fantasy XIV system report? Simply go to the 'Config' option on the Final Fantasy XIV launcher and to the right of 'System Information' click on 'Display.'

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!