ej juego reduce la carga y baja los fps

good mornig It has been presented to me, I was on my computer playing another game, then I started playing minecraftThen it started as if it didn't take long to load the window

and if it is an application and something like this never happened to me then the normal game loads me, but where is the mojang logo like 5 minutes and I wondered what happened

if my pc has more than the recommended resources then it loads me and I enter my map when loading the map the fps dropped horrible to 1 fps after 20 seconds the game remained at 40 fps

and it showed up as a game bug and it showed up on 8 computers with more resources than mine it is a fatal fps crash error this may affect you in future hope you can fix this at 20w17a

these are the reported errors

1-the game reduces when loading

2-when loading a map the fps go down to 1

3-fps are kept low

on the computers I saw what happened this was more than 4 gb of ram and 1800mb video I don't know if you see this on your computers

I wait too that they put more optimization 
and more performance
and that the fps go up so that the game stays stable and no serious errors occur
Why have I seen this in other games and fps crash the game gets damaged
I hope they solve this in 20w17a
thanks