I'm playing the beta using an RTX 2060, and when the game drops below 60 fps, input lag becomes incredibly noticeable. Below 50 fps aiming at small moving entities such as rabbits becomes annoying due to very delayed mouse movement. This might be related to the VSync implementation in this specific version.
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Thank you for your report!
We're actually already tracking this issue at MCPE-69556, so we will resolve and link this ticket as a duplicate.
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NVidia has a Minecraft Specific Driver.. have you updated to it yet!