As a participant in the Vulkan experimental release, I can say that rendering and speeds are generally better. We are working through the problems (and we are reporting them, and HG are releasing patches).
The trouble at the moment is not speed, which is generally better, but stability. There can be frequent crashes, and occasionally strange graphics behaviour.
But that’s why its an experimental release. So we, the great horde of unacknowledged beta testers, can work out the bugs, so, eventually, everyone else can enjoy a game that just works.