Garrysmod Server [LAG Issue]

Hello guys, well i just purchase a hosting for my Garrysmod Server

But for some reason when the server get 20/32 or higher the server start lagging, is not TOO MUCH Lag but lag is lag… so i was wondering:

There’s a way to give like idk more processor to the server ? major priority ?

This is a big problem :S, i hope someone have ideas of how i can handle out this !

Thanks!

Currently srcds will only use one of the cores. But with 20 players that should be enough.
Which gamemode are you running?
What is your tickrate on?

DarkRP Server and my tickrate is 33 :S