Initially, the chunks were not loaded, and after re-entering the world, the character began to VERY slowly move.
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Can confirm both in 19w13a. That started with the new villager rules in 19w11a (bed instead of doors etc). Chunks loading very slowly. Sometimes it takes a minute until you can move a bit. Mobs running slow or in intervals where you can't see the motion between. Fighting agains mobs is horrible!
Duplicate of MC-146778