Degradation Override

Keyboard > O (the letter O)

Views menu > Adaptive Degradation Toggle

When on (the default), Degradation Override supersedes the adaptive degradation that can occur when you transform geometry, change the view, or play back an animation in a shaded viewport. In this case, the geometry remains shaded even if that slows down viewport display and animation playback. Animation playback might drop frames if the graphics card cannot display frames in real time.

Turn off Degradation Override if you have big models you need to navigate around and if you are finding performance to be sluggish.

Note: When you use arc rotate in a shaded viewport while Degradation Override is off, objects degrade to bounding boxes regardless of the adaptive degradation settings.