For no reason, certain things like splash potions, drinking milk, restoring a zombie villager, and potions wearing off are not happening immediately while moving, inventory management, and terraforming are fine.
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Comments 2
Memory: 522202816 bytes (498 MB) / 1556938752 bytes (1484 MB) up to 1556938752 bytes (1484 MB)
Your RAM is used up, assign more RAM to Minecraft, see MC-12949
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.