Ever since the release of 1.17, Caves and Cliffs-Part 1, my singleplayer worlds have had lag issues similar to that of realms. Mobs occasionally rubberband and blocks will break and then be immediately replaced. The issue is prominent in the Nether but is still common in the Overworld and The End.
Related issues
duplicates
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Thank you for your report!
We're tracking this issue in MCPE-120971, so this ticket is being resolved and linked as a duplicate.
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if your computer is beefed, like 16gb ram +, you might have my problem MCPE-144052 and just not have it as bad because your computer is so beefed.