If the GPU rendering of a single image takes more then a single frame time (usually 60Hz),
it makes sense to reduce display quality. Options are:
Remove displaying of the sides (thickness) of the layers: Menu - View / Thick Layers
Reduce sub-sampling: Menu - View / SubSampling
Make display window smaller
Reduce complexity of the generated mesh. Menu - View / Render Effects
(Note that default settings are not particularly high. Use this method if you have been increasing the mesh complexity before.)