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Re: Response time appears to be much higher on 7.78 version of libcurl (vs 7.60 version)

From: Daniel Stenberg via curl-library <>
Date: Sat, 18 Sep 2021 12:16:49 +0200 (CEST)

On Fri, 17 Sep 2021, Question Throwaway via curl-library wrote:

> With 7.60 I regularly will get an average of 450-500MS response time
> With 7.78 I regularly get between 4000-5500MS response time

Your showed code doesn't seem to be complete so we can't run that locally, but
I would suggest you try that test code on another platform first as I think
you'll see that there won't be any such extreme delays there.

Getting a ~10 times slower performance is not just a minor degradation or
wrong option. It's a sign of something seriously wrong. I would urge you to
get a full DEBUGFUNCTION log with timed entries to spot where all that time is
spent. Alternatively doing a full wireshark dump, but that might be tricker
for HTTPS traffic from that target.

Did you use the same TLS backend in both your libcurl tests? Does it make any
difference if you use another?

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Received on 2021-09-18