Algolia Data Center for graph.cool
You can easily get an idea of latency between the AWS Dublin and Algolia regions by looking at their status website:
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Here is the monitoring for the machine cluster Europe (FR) : https://status.algolia.com/clusters/c4-fr
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Below is the monitoring for a cluster of machines Europe (DE) : https://status.algolia.com/clusters/c1-de
TL; DR; FR - 16 ms, DE - 25 ms.
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You're right, the Graphcool backend is hosted in Ireland, eu-west-1. (I asked about their community weakness .)
When choosing a region for your Algolia app, the most important thing to consider is where your users will be. The latency of API calls from their browser / device to Algolia is the most important thing to mitigate, so searches seem to be very fast.
If your users will be primarily in the EU, Europe (DE) and Europe (FR) are good choices. If users are going to be split between the US and the EU, you might want to consider US-East.
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