Servers have got something like fps limit if you are not looking at it. But you should try install newest display drivers for your graphic card( or just reinstall them)
MTA has such advantage that augments a lot of problems with this kind of stuff, you can simply try to install another version of Game Booster but Im not sure it will help, I had similar problem with Xfire but it's completely other software
I think that you can't change hostname from localhost to your host
What's the problem in configuring MySQL server.
If you want i can configure it for you just send me files without password