I don't think the preview render has a gpu option. I believe that's only superfly

A lot of figures does bog down a scene. I did 70 once. It was horrid. For 10 models, try setting your preveiw settings to

It also helps to hide any figure you aren't working on. A quick way to do that is open your hierarchy window and click on the eye icon by the universe. Then just show the figure you want to use.

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