Meteor has to keep track of what data a connected client has already seen. The server does this so that it can always send the minimum number of messages required to get a client up to date with the latest data. Sometimes, you have multiple subscriptions that publish messages about the same collection. Meteor has to merge these messages into a single stream of added, changed and removed messages about a given collection. Sometimes this mechanism is called the "Merge Box." In this video I'll show you what this means and how it works.
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