Weird isusue when game runs minimized and paused and when you unpause it hits performance to halt. Unpause instantly fill up ram if minecraft uses 1gb of data. In other cases lagspike.

To reproduce chose big render distance, later on pause the game and after 30 seconds unpause it.
Whats more strange that performance is good with that amount of data before pause.

Unpause creates 300-400mb jump in memory usage

With 6gigabites of data this also happens.
The longer u wait when game paused+minimized the more lag hapens when u unpause it.