Firewatch may not be using your laptop’s dedicated GPU by default. NVIDIA and AMD have slightly different ways of enabling an application to use the dedicated GPU by default.
For Nvidia you can change the default from your Nvidia Control Panel. For AMD you can change the default from the Catalyst Control Center.
Check out this How To Geek article for a detailed walk though.
If your laptop does not have a dedicated graphics card, please read through this article. We are not officially supporting integrated GPUs.