Super heavy lag.

I’m getting super heavy lag, mostly (98%) on HL2RP. If anyone can help PLEASE help me. I have a new GC [Graphics Card] which I havent installed yet. I never had this problem on older versions. I understand this may not be a GMOD 13 problem, but I really need some help!

If I can I might try to record a video with free fraps just show you how bad it is.