I hope the day/night system Badspot releases won't be as laggy :(
Metro i dont think they'll be laggy, The mod Day/night cycle we have now is laggy becuase when it has to 'Lighten' or 'Darken' it has to change the lighting effet. so it 'Stops' it for a split second and thats when people 'Lag'
As it show the Day/night cycle in the new update preveiw video it looks like its going to run smoothly, and nice and will look really nice.
this might not make sence, I my sleep is awfull ive been up for about 30 hours now, i might be wrong with this just a bit.