Server: OVH, Discovery VPS with 1 vCPU, 2 GB ram and Open Litespeed, Location Frankfurt. with Centos 7.
Load Test at Loader.io with 800 Clients per Second for One minute.
Site built with Astra theme. No templates used, designed from scratch with Elementor Pro, Ultimate Addons, Elements Pack Addon, Rankmath, Instant Indexer Plugin, Zepto Mail and WPO for optimizing.
Tried same setup with Apache and with NGINX too, they simply failed after 100 Clients.