Some other users have noticed poor performance. Especially when resizing viewport boundaries.
Reading about this, it made me think of a feature request I posted, that if implemented might help you. Have a look and vote for which implementation you like (or none.)
- Feature Request: [Poll] Control rendering of model viewports globally
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Are the styles set for the SketchUp model scene pages (used for your viewports) using fast style settings ?
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Have you updated your Nvidia display driver recently ?
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What version / edition / release of Windows are you running on?
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Is your machine’s power settings set for performance ?
SketchUp Help Center article: Improving Performance