Browser games often rely on synchronous `localStorage`, which is limited to 5MB, blocks the main thread during heavy writes, and is easily modified in Chrome DevTools by players editing save values. Production game engines use **IndexedDB** paired with binary compression and HMAC checksum validation to ensure fast, tamper-resistant client-side save persistence.
1. Browser Storage Comparison for Game Saves
| Storage Mechanism | Storage Capacity | Thread Execution | Data Integrity & Security |
|---|---|---|---|
localStorage | ~5 MB per domain | Synchronous (Blocks 60 FPS loop) | Plaintext JSON string (Easily edited in DevTools). |
IndexedDB | > 500 MB – Unlimited | Asynchronous (Zero frame stutter) | Binary Blobs + HMAC-SHA256 tamper validation. |
