Bounding boxes when Orbiting
When there are a lot of complex objects in the scene, orbiting around may feel sluggish, laggy on slower machines.
Sketchup has this thing, where if it's too slow, it makes more complex objects display as only bounding boxes when orbiting around. This recovers the performance when rotating the camera.
This would also be useful for blender.
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And a bounding box threshold value in preferences.
Blender had bounding box as shading mode (like current wire / solid / material / render buttons) before 2.80 and there was "Display Tools" addon that had fast navigation mode: i.imgur.com/9225gtU.mp4
Post 2.80 it's still possible to turn on bounding display but it's per object setting so addon implementation might be much harder to do.