Software is more the issue and how it is being used. I have a group of software I use that is extremely speedy on my systems with no slowdowns, waiting etc.
My mobile system is a dell Inspiron 5406 2 in 1, 1165G7 processor, Xe graphics, 64gb of ram and an extremely fast SSD. I plug in external working and storage drives, an extra 14-inch display via HDMI when I am video editing and everything works great. I can edit quickly and efficiently using my mobile rig with minimal speed issues.
My workstation at home is an XPS8940 SE, it has a i7 10700 processor, 2070 super graphics, 128gb of ram, the same fast SSD for programs/os, a bunch of SSD/HDD inside for storage and project work. This system does NOT slow down at all. It chews through anything I put into it without issue.
Most slowdowns come from old crappy code that adobe is still using in their overpriced heap. I have moved on from adobe and use various better, lighter and faster programs instead of going down the hardware upgrade rabbit hole. Changing software has a much more profound effect on speed than changing hardware.