Apache/DOMjudge Tuning

In the interest of avoiding the issue we had last year we want to ensure we have plenty of web service resources available for DOMjudge this weekend. I have installed DOMjudge 6.0.2 and it seems to be working.

When I look at the current processes running (with the default configuration) I see five httpd processes and five php-fpm processes. From what I can tell, it looks like I should use php-fpm tuning parameters to greatly increase the number of php-fpm processes running. (We have 16 GB of RAM, so I see no problem with doing so.)

Does the DOMjudge team have any recommendations on which parameters to change to support 100 teams? Am I looking in the right place to ensure that we don't run out of web service resources again?

Marc