I've recently in the past 3 weeks have been only able to reach a maximum of about 80-90 Mbps when I am paying for 1gig . I used to be able to reach ~950Mbps, but in the recent 3 weeks I have been only getting 80-90Mbps. I've updated drivers, used different ports, ran antivirus software, upgraded my motherboard and cpu and ram (about 2 days ago), and have had technicians come out and say there is nothing they can do. They come to my house, plug my ethernet cord from my computer into their personal device and are able to run ~950Mbps, however, when I plug it back into my computer it only runs at 80-90Mbps. This tells me the cord isn't the issue either and that the network isn't the issue. Everything in my computer just seems to be perfect, so I have no idea what could be causing it. I've replaced my motherboard, CPU, and RAM, but I just can't seem to get the speeds anymore. I've done eveything I know to do. I've done extensive searching with results that tell me to change settings, I've changed one setting to make sure it was on 1Gbps Full Duplex, but that didn't seem to do the trick either.
PC Parts list:
ROG Strix b550-f Gaming motherboard
AMD Ryzen 7 5800x CPU
MSI Geforce RTX 2070 Super
Corsair Vengence LPX 16GB 3600Hz RAM
500GB Samsung 970 Evo M.2 SSD
2TB Seagate Barracuda HDD
PC Parts list:
ROG Strix b550-f Gaming motherboard
AMD Ryzen 7 5800x CPU
MSI Geforce RTX 2070 Super
Corsair Vengence LPX 16GB 3600Hz RAM
500GB Samsung 970 Evo M.2 SSD
2TB Seagate Barracuda HDD