The bug
In 19w08a, the loading screen now appears when changing mipmap levels. The problem is that while you are dragging the mouse to change it, the loading screen appears.
Instead, the loading screen should only appear once the mouse is released.
Linked issues
relates to 1
Comments 4
What if, like it was done for languages, the change is only applied after you press 'Done'? You might drag the slider multiple times before setting the definitive value, and this would avoid unnecessary wait.
Works as intended, sir