Nope, why use xml when SQL is easier and better?
You run a server, get 70 players online and it use 50% CPU.
If you change to SQL server, run 70 players, then if your unlucky you hit 7% CPU. (Or if ur a bit low on RAM)
But it dosn't require much to run, its very recomanded to stop using xml, which such bigtime. And start to join the modern world of SQL. sqlite, or mysql, all ur choise.