Autosave lags chunk generation, mobs, building/mining, damage given/received, players don't render in real-time. Autosave is caused by the player when chunks are being rendered, meaning 1 player traveling can cause the entire world to lag and be nearly unplayable. I heard disable autosave was coming and that was after Bedrock Edition released months ago. Autosave needs fixed AND disable autosave needs added.
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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