Mine is 4k too, great laptop. The only detail is the palmrest material is starting to get sticky, I think it is the moisture in my area, Buenos Aires, Argentina.
I've been thinking of replacing the XPS with a 6 core i7, maybe a gaming machine, Lenovo Legion 5 17 FHD to avoid high DPI or for 500 bucks more a macbook pro 16 to be able to try macOS development with Delphi, but in any case I am trying to have a speedy development workstation. I want to maintain the VM usage, it is better in my opinion.
10.3 Rio is faster because of IDE Fix Pack and LiveBindings disabling, I like the new features of 10.4 but decided to go back. I even tried installing it on the physical machine and it also lags. Maybe the IDE refresh is worse using 4K.
Personally I think Emba has lots of open fronts with the different platforms they decided to support, it is very hard to comply for a small company.
Carlos