Any way I can get that map browser?
If you have an account on GitHub, you have access to the automated CI builds. But I suppose you don't, else you would know that already.
So here it is, matching that change : https://github.com/Novum/vkQuake/pull/957, not even yet on master but with all the latest changes combined.
Besides the level browser borrowed from Ironwail, Novum just added a particular optimization for the case where huge bmodels would crawl the engine when looking at their direction, (Immortal Lock, Marroned, Moljnir... ) contrary to Ironwail which remained quite stable.
Now with that important problem solved, combined with quite a few other optimizations under the hood also made by Novum, I beleive vkQuake performance is now matching Ironwail's in all cases. (at last)
This is preview, given with no garantee at all.