The host must lower their in-game graphics settings to free up CPU cycles for networking processing. To help tailor this setup, please let me know:
Note: This method forces all three players to share a single screen split into sections, which significantly reduces your field of view and strains the host's hardware performance. Known Bugs and How to Fix Them stranded deep 3 player mod
The host connects a controller to their own PC to activate the local split-screen prompt. The host must lower their in-game graphics settings
The game user interface may glitch. Item duplication bugs, invisible rafts, or desync errors occur more frequently with three connections. Save the game often at shelters. stranded deep 3 player mod
[Revive] DownedTime = 30 # Seconds before bleedout ReviveBandageCost = 1 # One cloth bandage needed to revive teammate