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You should compare Flask to Express or Koa, not raw nodejs. Flask is 3x faster than Express and 2x faster than Koa.

The thread-starter's question was asking about Flask vs. Node.js and Tornado, so I answered accordingly.

Followed the link, it shows plaintext from express at 2.1% and flask at 1.3%. Am I missing something?

Flask is on there about 3 times, with different choices for ORM. It's at about 8% when used without an ORM. There's no sans-ORM configuration for Express, though, so still not an apples-to-apples comparison. I suspect the grandparent missed the other Flask configurations in the very long list.

Can you cite your source?

Just follow the link to the Techempower benchmarks on grandparent's post.

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