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Have you sent a bug report? Checking your profile, I think you have not. Most issues are already known, but your input is also valuable for the devs as no two devices are the same. So I would suggest you to send a bug report for your issues with proper logs so that they can work on it.
I agree with you. Experiencing massive lags and frame drops while playing pubg mobile. I know this is an miui issue and not a game issue because there have been no game updates. Tried everything possible but no solution :( ffkn miui does not allow you to downgrade to 10.2.2. also. Absolute trash. Please help someone.