People forget mir works a lot differently to new games interms of how things are processed, packets prepared and received/sent, its old, it dosnt send a lot of packets compaired to games like WOW, so gamebooster makes massive differences between old and new.
Gamebooster adjusts, services, desktop settings, performance settings, disables background programs, registry files and changes how packets are sent
witch is why a program like gamebooster has a different effect on a game, like mir, the person using the program might only notice the game being smoother in there eyes, but the fact you are now transmitting and receiving your packets alot faster then players not using it, giveing you a massive advantage, as your always 2 steps ahead before it even registers on there screen that you have even moved......
you don't notice this so much in 3d games like wow as things are optimized better and lag is experienced in different ways (usually rubberbanding small increments, and as theres so much more going on FPS becomes more of a main aim)
But it dosnt work like that in mir, because of the way you move and are place on the map.
So yes things like gamebooster do give you advantages with a game this old, and it shouldn't be allowed, we should all be on a even playing field(ping/lag issues is something completely different, try a service like WTFast if you have high ping from living over seas).
People clearly know what there doing, and know in doing it gives them advantages.
Having an attitude like "if you dont want to download it then dont! but dont take it from those that can be arsed" just shows people want an advantage over others.
Noone should have to download additional software or adjust windows system files just to be on a fair playing field. (if you looking for PC performance that is different.)