Trying to play zombies (2 computers same network - host is on Ethernet, 2nd PC on Wi-Fi)

Normal connection through friends list, 2nd PC had consistent connection interrupted throughout whole game

Switched to LAN mode (connected via "connect ipv4"), game seemed smooth until I alt-tabbed once, then had same continuous issues as normal connection mode

Just trying to relive the glory days with my brother guys, help me out