If your Surface device is running slow, you can improve its performance in three ways. 1) Install updates, 2) Be choosy about what apps launch when you start, 3) Adjust Windows appearance

You can also check out this article on  What to do if Surface is running slower than you’d like at 

For more tips like this, check out the working remotely playlist at www.youtube.com/FoetronAcademy . Also, if you need any further assistance then you can raise a support ticket and get it addressed.