60 FPS with 600 Snakes: How I Got the Browser Client to Survive a Room Full of Snakes

Short summary

Technical deep-dive into optimizing a multiplayer browser snake game (Phaser 3 + React 19) for 60 FPS with 600 snakes and 1,600 food items across a 16M-pixel map. Key techniques: viewport culling with hysteresis buffers (90% performance gain), client-side prediction for sub-50ms input latency, and server reconciliation for smooth remote movement. Includes specific code patterns, tuning values, and architectural trade-offs.

• •Viewport culling with 100px hysteresis buffer reduces render load by 90% by only creating/destroying Phaser objects for visible entities
• •Client-side prediction using identical server physics + interpolation (0.2 lerp factor) achieves sub-50ms input latency while keeping network calls at 20 Hz
• •Separating React UI layer from Phaser game canvas prevents React reconciliation from blocking the fixed-tick render loop

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