Why does Garrys Mod have low fps on good hardware?

[Monksnothome]

Whenever I am running Gmod I get low fps on servers especially Darkrp. I have confirmed its not my internet connection (230mbps download) and I have also checked its not the servers ping or my ping. The interesting part is that it happens on certain parts of the map but that doesn't quite explain the low fps because other people get like 40-200fps when im getting 12-28fps on the map. I have been having this issue for quite sometime now and it's really starting to bother me for the fact that I am able to play GTA 5 at 60fps but I play a 2006 source game at like 20fps. I will list my specs below, thank you.

Intel i5 7600k 3.8ghz
8gbs ddr4 HyperX memory
Nvidia MSI 1050ti 4gb OC GDDR5
Motherboard - ASRock Z270M-ITX/ac LGA 1151
Monitor - Dell 24" LCD LED Widescreen Monitor
Operating System Windows 7 64 Bit
Internet Speed: http://www.speedtest.net/my-result/5986997348

 

[Roess The Great Tech Guy]

I think your GPU or something is overheating did u overclock something?

 

[Carnaxus]

Garry's Mod runs on an older version of the Source engine that does most of its rendering on the CPU instead of the GPU for some unknown reason. It's also not capable of using more than 1.5 cores unless you do some funky settings stuff, and even then it'll only go up to a full 2 cores. My computer is also a monster, but GMod chugs at 10 FPS (and occasionally less!) if there are a lot of people building stuff in Sandbox mode.

 

[Monksnothome]

I think your GPU or something is overheating did u overclock something?

My GPU is not over heating its always running at a steady 40c-50c I did not overclock my graphics card.

 

[Monksnothome]

Garry's Mod runs on an older version of the Source engine that does most of its rendering on the CPU instead of the GPU for some unknown reason. It's also not capable of using more than 1.5 cores unless you do some funky settings stuff, and even then it'll only go up to a full 2 cores. My computer is also a monster, but GMod chugs at 10 FPS (and occasionally less!) if there are a lot of people building stuff in Sandbox mode.

Thats very odd because I know some people who have similar systems but they don't lag they get 40-80fps and these people have Intel i7's and 16 gigs of ram I have heard it may be my addons but from my knowledge It shouldn't be my addons.

 

[Carnaxus]

That could also be the case. How many addons are you running?

I think I'm running something like 1200 lol...