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    <p>With Meteor, you don't have to worry about caching Mongodb queries. Meteor does that for you. Per <a href="http://docs.meteor.com/#dataandsecurity">the docs on data and security</a>:</p> <blockquote> <p>Every Meteor client includes an in-memory database cache. To manage the client cache, the server publishes sets of JSON documents, and the client subscribes to those sets. As documents in a set change, the server patches each client's cache.</p> <p>[...]</p> <p>Once subscribed, the client uses its cache as a fast local database, dramatically simplifying client code. Reads never require a costly round trip to the server. And they're limited to the contents of the cache: a query for every document in a collection on a client will only return documents the server is publishing to that client.</p> </blockquote> <p>Because Meteor does poll the server every so often to see if the client's cache needs patching, you're probably seeing those polls happening every now and then. But they probably aren't very large requests. Additionally, due to a feature of Meteor called latency compensation, when you update a data source, the client immediately reflects the change without first waiting on the server. This reduces the appearance of performance reduction to the user.</p> <p>If you have many documents in mongo, you may also be seeing them all get fetched if you still have the autopublish package enabled. You can fix that by removing it with <code>meteor remove autopublish</code> and write code to only publish the relevant data instead of the entire database.</p> <p>If you really need to manage caching manually, the docs also go into that:</p> <blockquote> <p>Sophisticated clients can turn subscriptions on and off to control how much data is kept in the cache and manage network traffic. When a subscription is turned off, all its documents are removed from the cache unless the same document is also provided by another active subscription.</p> </blockquote> <p>Additional performance improvements to Meteor are currently being worked on, including a DDP-level proxy to support "very large number of clients". You can see more detail on this at <a href="https://trello.com/board/meteor-roadmap/508721606e02bb9d570016ae">the Meteor roadmap</a>.</p>
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    1. POHow can I cache the data in Meteor?
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    1. COVery thanks!!!!
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    2. COBut the question is ,for example, I have a site, and people everytime comes to the homepage ,they must load the data all from the meteor server !but if you use other language or framework,you can use varnish or squid to cache the homepage,load the data from the cache server.What i mean is ,can i have a varnish or squid or nginx before my meteor to cache something,can the cache server understand Meteor's DDP(or websocket)?
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    3. COThat's currently not possible but it's under development, so check back in a few months and keep your eye on the Meteor roadmap.
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