What accounts for the drastic superagent performance advantage over every other HTTP client?

[gajus]

I am guessing you are familiar with the internals of these libraries (given your interest to create a benchmark).

It surprises me that superagent outperforms request/ got. What accounts for the drastic superagent performance advantage over every other HTTP client?

[fdesjardins]

No idea, I haven't had a chance to dive into the internals of all the libraries I've been testing. I was also surprised by superagent's performance over most of the other libs. They must have some trick, but I'm not sure what it is.

[yunnysunny]

superagent set tcpNoDelay to true, I think it may take effect for performance.

https://github.com/visionmedia/superagent/blob/67a5eee7bc1c22a56b1bc5a5486488f8a5303c05/src/node/index.js#L768-L769

and it set agent to false, which will drop the support of keep-alive:

https://github.com/visionmedia/superagent/blob/67a5eee7bc1c22a56b1bc5a5486488f8a5303c05/src/node/index.js#L154

I have pulled a new request to check it : #5