Noticible wait between breaking or updating blocks/mobs

Blocks and doors and anything moving takes a second (or more) to update/remove it's self/or open (doors and trap doors) feels like lag but not visibly lagging, only affecting blocks it seems. Breaking a block there is a noticeable wait before it breaks, also watching slimes jump around on my flat world, they kinda just do it in spurts like they are lagged, but no visible lag in players actions and movement.