Scaling the delivery of posts and content to the follower networks of millions of users has many challenges. In this section we look at the various approaches to fanning out posts and look at a performance comparison between them. We will highlight some tricks for caching the recent timeline of active users to drive down read latency. We will also look at overall performance metrics from Socialite as we scale from a single replica set to a large sharded environment using MMS Automation.
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