Games not smooth when I play while internet is connected

Question

I noticed that my Counter Strike: Condition Zero game is not as smooth as when internet is not connected.
I mean when I walk/run in game, the screen hangs (hang could be a wrong word here) for milliseconds. It's very subtle but irritating. So overall, game is not smooth. I think it is called FPS drops.
Note that I don't play online game. I just play Tour of Duty in this game, which requires no Internet.
One way to fix this problem is disconnect Internet when I play, but I don't even understand how Internet is messing up with the game.
I feel it is somehow trying to connect to internet, don't know why would that happen when offline version don't need Internet at all. Could it be because of platform/config/MasterServers.vdf file? I saw there are lot of IPs.
IMPORTANT EDIT:
Today I noticed that it wasn't happening to this game only, it is happening with 2 other games I play, GTA5 and COD4. Earlier I thought it might because my Graphics card is not strong (940MX), but even when I play at lowest settings, I saw this non smooth fluctuations in the games.
So I feel it's definitely not because of Graphics card and my PC (which is i7 processor, 16 GB RAM). Because CS:CZ used to run pretty smooth even with Intel HD graphics. And it consumes very less RAM.
This similar problem I face when my laptop is not plugged in for charging i.e., it runs on its battery. But I guess that is a power related issue and makes sense.
So what could be the reason? All of these games I play in offline mode, Internet not needed. Can Wi-Fi Internet really mess up with games like this?

Vikas · Accepted Answer

Problem is solved.
When I had posted this question, I was still trying to find issue on my end. After a lot of hit and trials, I felt that if the problem is because of Internet, let's check who's using Internet.
I closed my OneDrive and other apps that consume Internet in background.
Firefox was also using Internet in background. I ended the processes of Firefox and restarted my PC. But issue was still there.
Again I checked who's using Internet. Same story. But I was surprised to see Firefox again in process list of Task Manager, even when I didn't start the Firefox browser.
I tried setting a few config false to disable auto start in background, but it didn't work. Then I noticed it was using my CPU from 70% to 80%. And it would use CPU only when it is connected to Internet.
So I thought this might be messing with my games.
When I couldn't fix the browser problem, I asked a question on Superuser about this specific problem.
So all problems were originated from a few crypto-currency malwares. Once the browser got disinfected from malwares, the game problem was fixed!
It was very weird thing. Never imagined there could exist a malware like crypto-currency mining malware.

Games not smooth when I play while internet is connected

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Problem is solved.

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