He is talking about LAG, not FPS, lag is totally different, and although this mod might help some people, it wont stop lag that is caused by the servers in the path between your PC and the game server.
Also, not only did I not see a before/after comparison, by running in a real match, there is no way to actually say it worked or it didnt work.
Leatrix Latency Fix is one I have tried that does improve latency, and works (in theory) for everyone; the minimum theoretical ping from where I am to my favourite game server is 80ms; my pings prior to running the fix were averaging 100-110ms, and after the fix they were 85-95ms; which although not a huge improvement overall, IS a big reduction (~50%) in the 30ms difference between best possible and what I was actually getting.
As for improving fps; if you have a large multi core cpu, by running the task manager and selecting the game exe file, you can set "Affinity" for the game to use the cores that the system is using least for back ground and OS tasks.
I dont know how many cores Gmod want to use, and I dont know what your cpu spec is, so I dont know if it will be of any use to you.
With enough cores, and a game that cannot use all of them, I have increased the cpu cycle time the game has access to by around 20-30%.
My cpu has 6 cores, and my favourite game only uses only 2.
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