I think the performance highly depends on your requirements and resource availability. Prefork is an excellent option if you have better RAM. But when it comes to servers with relatively lower RAM, Worker and event appear to out perform prefork.

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For your information, my issue with MPM prefork was related to wordpress. For some reasons, the Mariadb transactions are slower using Prefork rather than worker with Wordpress. I used other CMS or coded myself PHP to mariadb and saw that prefork was great. .

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Prefork is a more stable mpm. But both memory and CPU have their disadvantages. Not efficient in process management. Separate processing for each request is causing high resource consumption.


Mpm event is more efficient in resource usage. But in some cases it is not as stable as prefork.

I'm testing mpm event + php-fpm. I did not have a big problem, everything is fine.