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Connection & speed

How rollback helps NES multiplayer

The engine briefly predicts remote input. When actual buttons arrive, it can restore a snapshot and replay frames to correct the result.

Joybito team

What to do

  1. Keep game files identical.
  2. Keep both tabs visible.
  3. Ask the host to restart if synchronization stops with an error.
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Technical references

Related guides

Connection & speed

Reduce lag in browser NES multiplayer

Responsiveness depends on both devices and the network route. Direct WebRTC and server relay can take different paths.

Connection & speed

Wi-Fi or Ethernet for NES online?

Stable packet delivery matters more than headline download speed. Busy Wi-Fi can cause varying latency despite a fast speed test.

Connection & speed

What do P2P and relay mean?

P2P sends game messages directly between browsers. Relay routes them through the room server when direct traffic fails or stalls.

Connection & speed

Troubleshoot NES multiplayer with a VPN

A VPN changes routes and may affect browser connections. It can help or hurt a specific connection; speed improvements are not guaranteed.

Connection & speed

Room connects but gameplay stalls

Room membership uses WebSocket; direct gameplay can use WebRTC. A managed network may allow one connection type and restrict another.

Connection & speed

Why does the NES site need HTTPS?

Gamepad access and Web Crypto depend on secure-context rules. Public deployment should use HTTPS and secure WebSocket connections.