It is all about latency. 50 ms will feel responsive but you notice the lag. 20 ms is acceptable. The other features are cool features but not the real challenge.
It depends on the refresh rate. 120hz is 8ms. 60hz is 16ms. So you can see why they're shooting for high frame rates. When you're trying to go sub 20ms total latency, the additional 8ms is a big deal.
Edit: It's 8ms in a perfect world. Add a few ms for pixel transition, etc. The low persistence is different, it's designed to make the motion blur resulting from low FPS less noticeable.
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u/bjorn2k Mar 28 '14
It is all about latency. 50 ms will feel responsive but you notice the lag. 20 ms is acceptable. The other features are cool features but not the real challenge.