I experience a very bad performance during the time lapse between turns. It sometimes takes up to almost 10 seconds before the next turn is there.
That is not the case with BTS original.

Anyone else has this issue?

yes until i bouth a real computer

and i star having problems with vista

Yeah, it is slow. This is due to all the python components in the mod; one of the things done in BtS was to disable performance-intensive but unused python calls, and Star Trek uses nearly all of them.

I had this problem with the biggest map, but going one step down (and using fewer civs) I went from 10+ seconds to less than 5. But really, when you get to a certain size (of empire) it won't bother you very much. Some mods I played in the past had MINUTES in between turns.

The DS9 scenario gets to minutes between turns after a while. For stuff like that I recommend playing in window mode; at least then you can do other things on the computer.

I see. Too bad, it's quite killing the game experience for me.