In prerelease 4 (didn't test in other snapshots) I get 40+fps with a mob farm that contains a lot of pistons. But in 1.16.0/1.16.1 with the farm active I barely get 3 fps. If I freeze the game or turn off the farm the frames return normal.
EDIT: Server impact is the same, about 30mspt
EDIT 2: Light updates are not the issue. (Even though light updates are already pretty laggy client-side.) The lag described above is in the nether with no skylight and no light sources anywhere near pistons.
Also occurs if trying to fill an area with tripwire that has an entity within that region being filled or if an entity touches the tripwire afterwards.
In prerelease 4 (didn't test in other snapshots) I get 40+fps with a mob farm that contains a lot of pistons.
But in 1.16.0/1.16.1 with the farm active I barely get 3 fps. If I freeze the game or turn off the farm the frames return normal.
EDIT: Server impact is the same, about 30mspt
EDIT 2: Light updates are not the issue. (Even though light updates are already pretty laggy client-side.) The lag described above is in the nether with no skylight and no light sources anywhere near pistons.