The "frame lag" you're talking about is just Hz or FPS rewritten in milliseconds per frame. But that's an important number to bring up, since it is definitely noticeable when something doesn't change for 16 ms versus 4 ms. 120 Hz is ~8 ms and 240 Hz is about ~4 ms.
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Agreed, 144hz is noticeably different from 60hz. I got some refurbished ones and going back to 60hz is painful. Everything just feels so laggy.
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The "frame lag" you're talking about is just Hz or FPS rewritten in milliseconds per frame. But that's an important number to bring up, since it is definitely noticeable when something doesn't change for 16 ms versus 4 ms. 120 Hz is ~8 ms and 240 Hz is about ~4 ms.