As said in the title, If there are too many entities in the world then something's start to not function
Example: I was playing the beta for the first time (1.16.230.52) and wanted to test the fact that if you have oxidised copper or lower then it goes back a few stages to normal block of copper if a lightning rod nearby and is struck by lightning, but when I changed the weather to thunderstorm suddenly, breaking a block will not bring any particles, Skulk Sensors don't react or 'produce' vibrations and most of all you can't open inventory for a long time and you can't change the weather for a while also the pointer glitches, please fix this because it will make a great improvement to the game performance.