Using Fast Tracking can help a lot when moving the camera. You can use small low quality image maps, simple shaders, and low quality render settings whilst setting up the scene, and only change to high quality version in the final stages of tweaking the scene. If feasible do the posing, or as much of it as you can before injecting morphs into the figure. Hiding figures and other elements of the scene that that you may not need to see all the time can also help. If the camera settings have been finalized, you can paste into the background before hiding things. Where feasible close other applications that may be running in the background.