Faradise

Considering it happens every time he downloads from Steam and that it's happening at roughly the same interval after he connected, I doubt it's Steam. We also live in a region which I doubt many people downloading games at the same time. From what he said to me, I can safely assume it's also happening to his other services. Tho I'll ask for more evidence.

If they want to be jerk, they can just cap his speed all the time. This is also the first time I've heard of this with his ISP. Though I think he hasn't report this to his ISP, so that's worth a try.

So my friend came to me (thought that I'd happen to know about Networking even though I majored in Computer Science) asking about what's been happening with his home network. Apparently something is throttling his internet speed. I chose the word throttle because his throughput would be fine during the first minutes of connecting. Then after usually 2-5 minutes, the throughput drops significantly. This is also not a new problem to him as he has few workarounds to "reset" his PC's network interface just to get his full speed back. These are: Turning on and off Firewall Changing the network profile. Enable and disabling the network adapter But these workaround still result in the same phenomenon, after just 2-5 minutes the throughput will drop back to low numbers. Can anyone explains what might be happening? Some additional info: His ISP's official network bandwidth is 150 Mbps. His Speedtest result: His real-world scenario (Steam Download) before the phenomenon: His Steam Download speed after he changes his network profile: His Steam Download speed (again) after some time: