I have a memory_limit of 5.9 GB, and if you're not sure how to configure php-fpm, ask the server administrator to increase the number of subprocesses in the PHP settings."
haha... I'm the server admin. and I have no idea. Something I have to learn. Any tips?
/etc/php/7.x/fpm/pool.d/www.conf (7.x changes to your PHP version)
for exampl:
pm = dynamic
pm.max_children = 50
pm.start_servers = 10
pm.min_spare_servers = 5
pm.max_spare_servers = 20
