Performance settings

Why has the texture resolution setting disappeared and been replaced with "Pause on focus loss" What does that even mean?

 

What is the purpose of this adjustment?.

 

Also wondering the same thing

 

When you alt-tab out of the game, the current session will get paused without you needing to push the pause button if this setting is on.
If it's off the session will continue, which can be quite handy if you want to let a practice session finish naturally without hitting the skip to end button.