Apple iMac 27-Inch (2019) running bootcamp has slow internet speed

Bootcamp was running fine and all, the internet speed was solid 80mbps all the time, but after I gave Bootcamp more disk space, by partitioning the disk while booted in MacOS, and using 3rd party disk manager software in windows, the internet speed fell down drastically. (30-40mbps) then, I reinstalled Bootcamp. The internet speed was 100mbps+ during the first few hours after the fresh installation, but after rebooting the pc, the internet speed fell down again. There were packet loss and ping spikes while gaming and the internet speed is always below 50mbps, while on the MacOS counterpart, the internet speed is well over 80mbps on fast.com. When testing on speedtest.net, the download speed is 60, but the upload speed is barely 40 in windows.

The internet speed went back up to 90mbps when I disabled the 802.11ac driver and enabled it, but it also went down.

This is the current network driver: