The world is a big place and that in itself is a problem for the TCP packets that carry your queries and results back and forth over the internet. Bounded by the speed of light - and other factors - talking to a database on the other side of the world can be sluggish.
That's why [MongoDB Atlas's Global Clusters](https://www.mongodb.com/cloud/atlas/global-clusters) exist - if you can't move the speed of light, the solution is, thanks to a distributed architecture, to move the data closer to the user. And that makes your application run faster all around the world.
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