Thats exactly what microsoft suggested and I did.
Then last week they replaced the surface pro 4 and after installing over the weekend back to same problem.
Other Photoshop users of 2017 and 2018 CC versions are complaining about slow response and lag, not due to their computer. The problem appears to be with Photoshop.
Users have noticed that the longer Photoshop is open, the slower it becomes. Also, changes to program settings may be necessary.
I believe your Surface Pro 4 is not at fault, but it is Adobe software problem.