Bake the draft version of your model in order to see places where it needs improvements.
In the Bake tab, set the number of Samples to 100 and click the Bake button
❕ Baking the draft, depending on the size of your model and your machine, might take from a few to about 15 minutes.
The results of baking the draft will be visible directly in the Viewer windowWhen the baking finishes, the scene is reloaded to show the baked lighting; you will see the bake job on the Finished jobs list.
Your model will look now a lot more realistic and this is a good time to look around again to see what could be improved.