sudo nano /etc/php/7.4/fpm/pool.d/www.conf

#change php version

​

#increase max_chilren

pm = dynamic

pm.max_children = 25

pm.start_servers = 10

pm.min_spare_servers = 5

pm.max_spare_servers = 20

pm.max_requests = 500

​

#restart php

/etc/init.d/php7.4-fpm restart