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Every blog post that took off on Hacker News, ranked by the votes of its best submission. 4,109 posts.

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2025
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The Mythical IO-Bound Rails App

When the topic of Rails performance comes up, it is commonplace to hear that the database is the bottleneck, so Rails applications are IO-bound anyway, hence Ruby performance doesn’t matter that much, and all you need is a healthy dose of concurrency to make your service scale. But how true is this in general?