@TIG, there’s a sentence in post 5 about doing it - hiding in plain sight. This problem was annoying.
@teddrandrll, now more more homework, How do I make SketchUp run faster. SU has to re-render everything in the workspace every time the camera moves. How smooth this process goes depends on what’s going on in your file - raw geometry, Style settings, textures,
By any chance did you keep a record - even a screenshot of what startups you disabled? This has happened before. Most recently, AMD bundled an app called Play.tv with its driver updates which caused problems with SU.