Screen Bones
Assigned
Reported
Comments
Gonna need more details than that. Are you talking latency or low FPS? What Android phone/tablet are you using? A Model Number would be incredibly useful. I'm using a OnePlus 6T to play Minecraft and it runs just fine, no lag here. Have you considered the possibility that your phone isn't powerful enough to play a game like Minecraft?
Yup - Mojang is aware of this issue, and has a fix in Beta. This is a duplicate of MCPE-71243.
Are you still having this issue? If so, which Minecraft launcher are you using? Did you download the .msi launcher, intended for Windows? If so, try downloading the Linux launcher, it's just a .jar file, so it should work assuming you have Java installed.
If not, what computer do you have? I can take the name or it's model number, along with the manufacturer. If it's custom-built, what components did you use? What do you usually do when you're not playing Minecraft?
Don't really have an Xbox to test that - but the platform marked for this bug report was for Android, that's why I focused on Android. In the context of this specific bug report, and absent any other details, I can say that this is likely not a Minecraft issue, but likely an issue of OP's device, as I do not experience this issue on my own Android device.