I played for about two hours last night. I exited my game (to title) and went to bed. 8 hours later when I went back in, this game got slower and slower and began saying the clock was behind 4 seconds, etc. I have shutdown and rebooted but get the same reaction from this game.
Games running on 12.2 don't have this problem.
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Not a particularly useful resolution by @unknown. I think there is another ticket for an issue like that, but it's not that one.
I think the proper duplicate is MC-121318... I remember there being one that specifically referenced the title screen (though that might have just been in IRC or something in reference to that issue), but I can't find it.
I have upgrade to java to jdk1.8.0_171.
I tried to increase memory with -Xms4096M -Xmx4096M on the command line
Renamed my old .minecraft folder to .minecraft-old to force all files to download again.
I tried the alternative download at, https://minecraft.net/en-us/download/alternative
I was able to create a new world in 1.12.2, but still have the problem when going to the game made with 18w21a.
Trying to force load my 18w21a file in 1.12.2 just gets me hung at Loading World
Duplicate of MC-12949 – If you have not, please use the search function in the future, to see if your bug has already been submitted.
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