Minecraft is unplayable.
I don't need to say too much more.

I will open a normal world and press my forward key... 3 seconds later I will move forward. This means parkour, pvp, any form of survival and even creative is impossible.
I will go for a run or I will go for a fly but I end up walking/flying over and into invisible blocks.
I am also experiencing the old block lag, even if I am using something like an unenchanted iron pickaxe.

There was not much lag up until 1.16.100 and got worse in 1.16.200 and then worse again in 1.16.201.