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Does your use case need low latency? No? Don't worry about it then. yes? Does it have clear measurable impact on the biz? No? probably wont' be able to convince anyone to do anything about it. yes? Show them the difference and clear benefits of how this improves customer/business value.

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It's a real time trading website, so every millisecond counts.

If it needs to be real time enough for trading then surely even the 15 ms for a non-TLS connection is too much? HFT system latency is measured in nanoseconds these days and I'm pretty sure the HTTP stack has too much overhead to be used in that domain.

Don't think a real time trading website has anything to do with HFT. Still, some of these trading websites that target day traders for customers need to be pretty fast.

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