Yeah, UPC use that network link.
Edit: Solved the my problem. Eventually this wasn’t a network issue (however i have a cablemodem /w Intel Puma 6 SoC 
) neither server side or ISP related but client side issue. Namely my CPU was performing poorly and couldn’t feed my GPU with enough datas.
This post helped my a lot to narrow down the root of the problem. I can say that it’s almost a must-have.
After applying the registry priority trick the game become much more stable but fps drop was still there, just happened much less often. So i had a strong guess it will be CPU related.
Finally it turned out my computer was infected with malwares resulting a ~30-40% CPU usage in idle stage (after start-up). One of them closed every web browser when i searched the terms: adware, malware etc. but couldn’t catch the mistype ones ex.: malvare.
I managed to install malwarebytes and run it in Safe-Boot mode. After getting rid of this malwares every problem was solved. My CPU usage went back to 5-6% in idle stage and google up ‘malwares’ didn’t end up with a closed browser. And ofc my FPS went back from periodic 30 to the stable 150.
Lessons:
-
Run a clean start-up and check whether it solved your problem. If so you may have a faulty driver, enabling them one-by-one help you to find faulty one.
-
Using antivirus softwares, firewalls are not enough if you don’t let them do their jobs (disabling them) or surfing the internet carelessly.
-
It doesn’t matter how silly a tip sounds try it out. (Scan malwares).
-
Scan can give you false-positive results during normal mode. Both malwarebytes and defender give me nothing when was run in normal boot mode. Reason is that viruses,malwares,adwares can place themselves during start-up into your RAM encumbering the job of these scan softwares. The best if you can use a bootable antivirus software to get rid of those things (Kaspersky Rescue Disk is a good one).
-
Single player games are less sensible for this kind of things. Assassin’s Creed Origins ran on Ultra /w stable >140 FPS.
-
Check HW temps. High temperature → Lowering voltage → Lower clock frequency → lower performance.
-
Bugging drivers. Reinstall/Update/Remove them.
-
Look around in the BIOS. Check your XMP profile (mine was on a default after a BIOS upgrade) and set your GPU’s PCIe link speed to Gen3 to prevent it going to low power mode. Perform a BIOS upgrade if needed.
-
Windows updates can hit the performance as well. Not just the newly announced features but security updates as well( but security updates are MUST).
-
Google up new Windows update optimization techniques and trying to disable new features. For example “fullscreen optimalization”. On the executable Right Click > Properties > Compatibility > ‘Disable Fullscreen Optimizations’. It helped me a lot.
-
If nothing works Backup & Windows reinstall. If problem is still around it’s probably really a server,ISP side problem, get those diagnostic files and post them without hitting a bad tone and PLEASE use </> option.
Happy gaming!