I can only tell what I've experienced. I regularly read the release notes, especially the sections on performance. And with each upgrade I'm hoping so much that we get back to loading times below 1 second (like it was with early GitLab releases).

Unfortunately this is almost never the case: Sometimes the pages load even slower. In the best case there's not much difference. Same goes for memory consumption.

But I understand now that this will always be a problem with rails.