Discord embarked on a six-month project to reduce bandwidth usage for their clients, particularly on iOS and Android, aiming to create a more responsive experience. The initiative focused on improving the "gateway" service, which provides real-time updates to clients, by transitioning from zlib compression to zstandard, which offers higher compression ratios, faster compression times, and support for dictionaries[

https://discord.com/blog/how-discord-reduced-websocket-traffic-by-40-percent

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