I’ve occasionally wondered something similar, as 4 bars per page is exactly how I work 99% of the time. (Basically, if you’ve ever seen anything in Herb Spencer’s hand, that’s the approach that makes sense to me, whether I’m on pen & paper or Dorico. I’ve tried other approaches and they just drive me crazy for some reason.)
I know nothing of programming software, etc., but my hunch is that, even if people who work like me weren’t a insignificant minority, the performance gains would be fairly minimal, perhaps not even noticeable, thus the pain:gain ratio wouldn’t be worth it.
Again, I’m no expert, but I’ve wondered this myself and I sort of doubt it would make a difference in Dorico. I have almost the same configuration as wonner has (though s/he may have a higher-end GPU; I went for the lowest-spec option) … every model of that machine comes with dual-GPUs, and I’ve never seen anything worse than ~40% and 15% utilization of the pair (processor; memory usage (cache?) was something like 75% and 10%). (I’ve heard some nightmare stories of GPU code degrading realtime audio processing, and some people (usually on Windows from what I can tell) saw an improvement when changing to lower-spec’d GPUs that had different code which didn’t steal from the DAW. But unless someone from the team chimes in to say otherwise, I’d really doubt GPU would make any difference in Dorico note-input/engraving.)
Marc, one thing you haven’t mentioned which may or may not be relevant: are you running any virtual instrument plugins or are you working in silence? If you’re running virtual instruments, hosting them outside Dorico results in performance gains for a lot of people. If relevant to your workflow, some hosts offer free 30-day demos you could evaluate. If you ended up purchasing, it could cost quite a bit less than upgrading hardware.