Since update on single player world I have experienced severe lag. The world seems to be trying to load everything (and in my unexperienced opinion) including non-player-populated chunks.
I experience loading issues and severe block lag. I have tried adjusting video settings including viewing distance and lowered all the extra effects to minimum or off with no avail.
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violine1101
Duplicate of MC-149178
I've had a similar problem in my single player. Extreme lag loading chunks and lags mobs all over like on a server. Changing settings doesnt help, neither did more ram. Loading chunks drop my frames worse than having 100+ mods installed. Vanilla 1.14 = Chunk loading lag