Well, I'm writing this message because I'm sick of an error that happens to me 100 percent of the time.

For starters, in minecraft 1.16.20 what this update did is that my minecraft would crash from time to time, honestly it didn't bother me but in 1.16.21 the crashes reach another level.
Playing Minecraft is almost totally impossible, these are the reasons:

1.Minecraft loads badly, because what happens is that it goes much slower and not little with that when it is about to load minecraft it crashes and I have to wait like 5 more minutes.

2.Once you enter Minecraft, it is just as bad because when I enter a world another lock, when I leave another lock, and as the icing on the cake when I return to the menu another lock.

If you are reading this I just want to tell you that this is preventing me from playing minecraft and I am already tired that when I want to play with my friends and spend time with them, minecraft will not let me.

PS: I am Spanish, for this message I have used the google translator, I hope you have understood the problem that happens to me