At Snapchat, our goal is to make our Camera the fastest way to share a moment. We do not want Snapchatters to face any delays when they are in the moment and want to share with their real friends.

Network requests are on the critical path of using Snapchat. Compared to a UI update or disk write that takes milliseconds, network latency can take seconds with high error rate and device constraints. To reduce network latency and error, we make requests and responses smaller, reduce unnecessary sync, utilize global content distribution partners to bring media close to the people who use it, and use an efficient, next generation network protocol called Quick UDP Internet Connections, or QUIC for short.

Read in full here:

https://eng.snap.com/quic-at-snap

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