Message Systems
How do Messenger and Telegram load thousands of messages almost instantly?
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How major messengers load, store, and sync messages — benchmarked against my own Message Cursor Engine, with the numbers published.
Telegram Doesn't Load Your Chat History. So Why Do Thousands of Messages Appear Instantly?
Telegram clients don't fetch history to render a chat — they render what they already know. A source-verified tour of pts, getDifference, known ranges, and the sync engine behind instant-feeling chats.
Uploading a Photo Is One POST Request. So Why Do Chat Apps Engineer It So Hard?
A 45 MB video, a moving taxi, a connection that dies at 93% — media upload is five problems wearing one trench coat. The full map: resumable chunks, optimistic UX, dedup, async pipelines, and the resilience layer nobody blogs about.
Coming in this series
- How Do Messenger and Telegram Load Thousands of Messages Almost Instantly?
- Inside My Message Cursor Engine: How It Works
- Why My Chat Was Still Slow — Even With a Local Database
- Cursor Pagination for Chat: Offset vs Keyset vs Snapshot
- Benchmarking My Chat-Open Time Against Telegram: Method and Results
- What I Changed to Cut Chat-Open Time