I agree, here are some things to check related to network issues in this game.
1: AntiVirus: Add a folder exception for the game folder and the save folder
in your antivirus software. (on both client and server)
2: Use Ethernet, not Wifi.
WiFi is half-duplex and subject to interference and latency.
3: oem gaming and lighting software like Gamefirst from Asus, Dell, HP, Corsair, etc.
Uninsall all this junkware.
4: VPN or proxy: Use split tunneling to add an exception for the game.
Or turn off the vpn. (both clients and server)
Another thing I've been seeing lately is routers that have security
features enabled that interfere with game connections.