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Best way to get your Surface to run Photoshop better?
First off, go and optimize Photoshop as best you can. Go through all of the optimizing guides providing by Adobe and others to tweak it to the best it can be. Then, until Microsoft fixes the Nvidia drivers, switch to using the onboard graphics card instead. Go to the Nvidia control panel on your Surface Book and change the Photoshop default to using the onboard Intel graphics chip instead. You're welcome.
I don't have any experience with the Surface Pro 4, so I didn't touch on it in the video. But I'm sure other artists with more experience would be able to share their experiences.
Thanks for watching! Let me know if you have any questions. I'd be happy to write up my thoughts and answer more questions if you've got 'em.