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This is a guest post by Nick Burling, VP of Product Management of Bluestripe.

Readers of High Scalability know are well versed in performance optimization techniques. Reverse proxies, Varnish, Redis — you hear about them daily. But what you may not realize is that one of the oldest technologies in your stack can be one of your biggest bottlenecks: DNS.

People don't spend a lot of time thinking about DNS. It's not sexy. It's an infrastructure service, and it's just supposed to work.

At BlueStripe, we work with many teams running applications that support millions of web requests a day. We keep seeing DNS delays and errors that the platform operations team never knows about. It's so common we've start calling it the Hidden DNS Tax.

What is the Hidden DNS Tax?

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