Speed & Duplex
parameter is set to Auto Negotiation. (You can set it to 1000 Mbps/ 1 Gbps manually). Power Savings
on the network adapter. Hibernation Mode
Prefetch / Superfetch
Over Provisioning (OP)
with %10 of SSD capacity.Over Provisioning (OP)
for the SSD will fix the issue. As I tried to delete it, when I did, the network speed immediately switched back to 100Mbps, and when I set the OP again, the network speed went back to 1Gbps.