Solution. ① NSP→Fiber optic modem: FTTP is available. Contact NSP. ② Fiber optic modem→Routers: WAN port supports Gigabit Ethernet. Contact routers’ manufacturers. ③ Router→Terminal: RJ45 port supports Gigabit Ethernet. Check NIC information and settings. (Device manager→Network adapter→Wired network→Properties→Advanced→
I had this same issue on a Lenovo T14 running Win 10. I searched the Intel and Lenovo boards for solutions without finding a working solution. I finally found something that works after searching for slow wifi with VPN. There is a patch/mod from Microsoft that fixed my issue. MSFT webpage here: WiFi issues with Creators Update - Microsoft
This package provides WLAN Driver (Intel, Realtek) and is supported on Lenovo Legion 5-15ARH05H, Legion 5P-15ARH05H,, Legion 5-17ARH05Hand running the following Operating Systems: Windows 10 (64-bit)

Mar 25, 2021 · Run a network diagnostic to troubleshoot the problem. In Windows 10, right-click the WiFi icon on the taskbar and select Troubleshoot problems. On Mac, select Menu > System Preferences > Assist Me > Diagnostics and use the Network Diagnostics tool. Update or Reinstall WiFi Adapter Driver

May 5, 2023 · Follow the below steps to fix this issue: Right click on the “Start” menu and choose “Device Manager” or use the “Cortana” search box next to “Start” menu and open “Device Manager”. Find out the adapter used on your PC under “Network adapters” section. In our case it was “Intel (R) PRO/Wireless 3945ABG”.
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lenovo wifi issues windows 10