Question Extremely slow internet on one PC

Nov 1, 2019
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Hi there! I have recently been having a lot of trouble with internet speeds on a new pc that I set up last week.

I originally found via wifi, my internet speed was awful (about a 0.5/1mbps) so I switched to a powerline adapter and I managed to get about an 8/10 speed. (might be worth noting my regular speed on all other devices is about 40/15). I discovered this morning that my internet speed had gone down to 0.5 again, and I don't know why. I tried switching my ethernet cable, switching to wifi, restarting etc. The strangest thing is that doing speedtests in different parts of the house (including where my computer is located from wifi) yielded speedtest results of 40/15, on multiple devices. I have no idea what to do. I can post specs if required but I don't know whether that is necessary at the moment - please let me know.

Thanks!
- Liam