My 1.9~ Map used to run well on higher versions like 1.10 and 1.11
But in 1.12 and further, my old maps have very intense lag like FPS are much worse than my new 1.13~ maps
Old maps also has glitches, like grass color corruption, chunk disappearing lag, entity misplacing and cloud distortion, not sure what's the cause of this instense lag
New created/newer maps don't have these glitches at all
(I can only show a 5 sec. video because my screen recorder was too hd and takes a lot of MB)
Only 2 of these worlds have the glitch
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Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response
Is this still an issue in the latest version?
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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If you have a copy of the world available, you might like to upload a copy of it for investigation.
On Windows 10 you can use the Export world feature.
On Android or iOS you need to use a file explorer to navigate to Device storage > games > com.mojang > minecraftWorlds
On Xbox or Switch the only way is to upload it to a Realm, and then download the world on Windows 10 or Android/iOS. (Please do not purchase a Realms subscription just to provide a world to us - but if you have a Realm already this may be a viable option if you wish to do so.)
If the world is larger than 10MB you can upload the world to OneDrive or a similar file sharing site, and then share the link.