I'm glad that it's such a priority that it's an OKR now, but there are public Gitlab issues talking about performance for the past 2 years. We did a full migration to Gitlab 3-6 months ago and had to migrate out into Bitbucket only a couple days later, as basic browsing operations proved to be way too consistently slow and was extremely aggravating.

It will take a lot to prove to us that hosted Gitlab is actually good performance "for reals this time".