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While I agree that some languages could speed things up I think the bottleneck in the majority of the webapps is the access to storage. A propper indexed DB or a cache will be much effective most of the times.

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Having a decent idea of how a language / framework works would make a big difference a lot of the time. I have seen a lot where joins are essentially done at the application level in loops in the relatively slow language.

> I have seen a lot where joins are essentially done at the application level in loops in the relatively slow language

That's an indication of poor programming skills rather than programming language being "slow".

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