When the game is paused, it still uses lot of CPU

jvisualvm profile dump. Looks like a LOT of the idle loop is spent continually saving files.

it's logical because even though nothing is moving, all the chunks are still loaded. just like when you are on a huge map like enterprise-D. nothing is moving but it still sucks up all your ram. it's either this or no pause at all. because what you're asking is pretty much the same as the save and quit button.

I vote for not a bug

I, too, believe this is an invalid/works as intended. The chunks are still loaded, but mobs are in a "paused" state.

I would imagine this to be a glitch(maybe caused because the game now thinks it is always in multiplayer) and I, myself have experienced this "lag" glitch and my fps seems to be stable when you stay still but as soon as i move it drops from about 120fps to 1fps and it it is quite annoying so please mojang if you are reading this, I am sure most people would appreciate this glitch being fixed, also i am reporting this using 1.5.1 so the glitch is still in the game

O.k., I understand what you're saying. I, too, get that. I thought this was something that is normal. Some programs have spikes like this, but it is not as severe as you are telling me now.

Confirmed for

• 15w37a A "The Void" preset without decoration paused still uses CPU from 3-5%

I see the percentage of "fpslimit_wait" slowly climb to about 62% when paused, even on laptop with 21 chunks render distance. "gameRenderer" takes up about 30%, but still way less than when not paused. Maybe it's something because the game keeps running when you are in pause screen on a server?

@unknown From 49% to 36% is a drop of 26.531%. Alternatively 13 percentage points, not 13 percent.

Can confirm in 20w51a.

We will look to improve this down the line, but the game is not expected to stop processing completely when paused.