Hey Friends, check this awesome tool we found! Magic Preview. This plugin allows you to view extremely fast previews of your scene while you work, instantly updating changes you make in the viewport. GI and Physical Renderer are fully supported as well. If you are already utilizing Octane or another GPU based render engine, the benefits of seeing changes to lighting and materials on the fly is clear.  If not, we suggest giving this plugin a run for it’s money.  You can download Magic Preview here.