In snapshot 18w20c, mobs lag and don't move smoothly, pistons' extension and retraction are very slow, items don't visually fall correctly and don't always get picked up when a player is near, and things like water and lava flowing is very slow.
Comments 2
We are unable to diagnose your issue due to the lack of proper debug information. Please review the guidelines before reporting issues.
In case of a game crash, please also attach the crash log from [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder].
-- I am a bot. This action was performed automagically!
Please do not mark unreleased versions as affected.
You don't have access to them yet.