如何在Nginx + php-fpm服务器上解决网站速度问题（一页500条记录）

Question

I moved me shop to new server and I have problem with loading time. I have 500 products in one page (no pagination), first loading takes about 8 seconds (in old server was 2 sec maximum). Then website works very fast because cache plugin is working.

I have Prestashop 1.7.5.2 with very good cache plugin and two powerful servers: Only with database: Apache, phpMyAdmin (RAM 60 GB, Processor 16 vCores, SSD) Nginx, php-fpm 7.2 (RAM 60 GB, Processor 16 vCores, SSD)

Only page with products have this problem. I know, 500 products without pagination is not perfect idea but it have to be like that. Maybe can be wrong php-fpm config? Currently I have this:

pm = ondemand
pm.max_children = 16
pm.max_requests = 4000
pm.process_idle_timeout = 30s

I will be very grateful for your help.