Block Entities, Sounds, Redstone Signals, Mob Movements(Not Model Animations),TNT explosions, Arrows, Pistons, Ect.
The following are having a MAJOR delay when processing.
Ex. When a slime jumps, it goes through five frames and the jump is over.
I'm guessing for Computer with good processors, they have a smooth jump.
For buttons, they stay activated(along with the signal they output) for about 5 seconds.
Also, before you comment, I got my computer in April so don't tell me to get a new computer.
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This might just have to do with lag, but your processor should be able to handle minecraft quite easily.
Lag just causes everything in the server (not the client) to go slower.