Golden rules
- Ethernet mandatory for host
- Close uploads (OneDrive, torrents, streams)
- Cap lobby at 8–10 players (dev recommends 2–10)
- Avoid hosting above 14 — desync and rubber-banding
- Pick host with best upload, not best PC graphics
Router
- Enable UPnP or port forward
- QoS prioritize gaming PC if router supports it
Hardware
UE5 load spikes when many players paint — close background apps.