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I currently have a unmanaged VDS with Windows 2008 R2 and I'm currently hosting my Garry's Mod server on it. Now the problem is that my server is having really intense lag once player count reaches 25+. Once it reaches 25+, cpu goes 100%. I've nearly removed all addons from addons folder and Workshop. So far I've seen minor improvement. I'm running DarkRP, tickrate is at 33. (that rhymes :p)
Have you verified that all of your addons are working efficiently and are fully updated?
@Kraze^NFo> Juski has a very valid point
@Juski> Got my new signature, thanks!
@Kraze^NFo> Out of context!
@Juski> Doesn't matter!
@Juski> You said I had a valid point! You can't take it back now! It's out there!