Development on Krita 5.0 kicked off a few months ago, and, as a major release, it promises numerous new features and improvements. The biggest change being an all-new resource system that has been in development for a few years now.
With the new resource system in place, Krita 5.0 will no longer load all brushes, gradients, patterns, etc. during start-up. Instead, it will cache all these information during the first run, which means that the app will be a bit faster when starting up, yet the first run will be slower as all the info needs to be cached.