Just chiming in to confirm here as well that the work on this is ongoing and that some other improvements were ready before the release, but didn’t make it in time for 9.5.0.
The work done in this regard was huge, not only with actually improving GUI performance and fixing issues, but also with analysis and research.
We do believe all spots have been identified, but it was not possible to fit all in, as it is often the case you actually have to wait until another work is done and well tested before proceeding.
So yes, improvements ongoing and some more coming soon 