the menus are very slow, when i click something it takes 3-4 seconds to load the menus, or not load at all
not an graphic issue, i get 40ish fps average, just the menus
it takes too long to launch the game too
i have a gt 620 1gb ddr3
cpu intel pentium dual core e5500
4gb ram ddr3
I agree the UI lag is quite bad, always has been 
Nothing against you but your system is really old.
NEVERTHELESS you are right, the performance needs to be tweaked but radiant is working on it.
Hope for the best 
yeah i will update to alpha 20 and see if it works 
The game is now on full release and i also have slow hud so i dont think they fixed it