Exactly what voodoo said. When you run the file for Leatrix you are adjusting the way your computer talks to the internet.
It
should lower latency for anything related to the net. So there is no harm in using it.
I have used it myself and can say for certain it has lowered my ping times in wow to less than half of what they were (average of 350 down to an average of 140) and has shown similar effect in most of the games I play.
The fact that you are showing no notable improvement for Ragranok Online may be the cause of other things. I would suggest you check your firewall and see if it is allowing the game through cleanly.
... And as an added bonus **shoots voodoo**
