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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