If you quit apps you're not using this returns memory back to the iPad for your other active audio apps.
If you turn off Wifi, you can keep iPad from searching for WiFi signals while you are using your audio apps.
Also, turning off Background App Refresh makes sure no background running apps are trying to update their content while still working behind the scenes.
I work with audio apps all the time on my iPad Pro.
The only things you want running on your iPad when doing audio work is JUST your audio apps and mobile external audio interfaces, if any.
You DO NOT want any other unnecessary apps running in the background that aren't audio releated and turning off WiFi, if you don't need it during audio work, eliiminates, yet, another active iOS process.