Something to read and better to look to optimize the code?

A couple of years ago I watched the report, if you don't lie to the speaker from the mail ru, he talked about the fact that when php performs for example the query to the database, then most of the time he is waiting for an answer, and while waiting takes time and here they are, as I recall, you wrote an extension in C to while waiting for the script not occupied the CPU time and at the end said that in python, go and nodejs this moment optimized. Already the 5th day of searching for this video. Throw, please the link on this video or on such or advise what to esteem on this issue?
July 2nd 19 at 17:49
1 answer
July 2nd 19 at 17:51
if you have php , that is reactphp

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