Hi, I have 1Gbps connection and i usually have >900Mbps in speedtest and download at 120MB/s, but now my pc and my brother's is getting around 100Mbps and download at 13-14MB/s (tried different sites/test from which test this), we are connected with a switch. I connected my ethernet cable to another computer and it goes at 1 Gbps so it's not switch/cable problem.
I don't know when the connection limited but the only app in common me and my brother installed is LogMeIn Hamachi, my first attempt to solve the problem was uninstalling anything related to that program but it didn't work.
At the moment I tried to solve the problem restoring to default the ethernet option, reinstalling different version of onboard LAN drivers (Manufacturer site, Windows automatic update and Motherboard manufacturer site) and desperately by cancelling Static IP from router.
It is almost sure that reinstalling windows will work like the first time that this happened to my pc but I'm trying to find a solution that don't imply reinstalling.