G Scott bought the Microsoft Surface Studio computer when it came out and got it with an i7. But it's sluggish when running Excel and other apps. Leo has a hunch that the hybrid hard drive is causing the slow down. Intel created the Fusion drive and it's never really paid off in performance. Leo had the drive replaced with an M.2 MVE connected SSD drive. Know How has a video on how to do it here.
Also, while 16GB of RAM is a hefty amount, if his spreadsheets are really large, it could bog down. So if he can upgrade the RAM, that would be a good idea.