How to test hosting performance?

Question

Performance evaluation

Greetings. I have more than 30 sites (domain + subdomains) on joomla. I ran into an uncomfortable situation. Namely, loads on the hosting CPU that are close to the limits. Previously, caching was turned off (didn't think of turning it on right away). Now included and theoretically loads should be less. And how to check it in practice without involving real users? Is there a way to emulate visits that is as close to real as possible? Well, for example, N requests per second to all sites (domain + all subdomains) at the same time.

Answer 1

Alternatively, https://habr.com/en/post/77593/
Does the hoster keep some kind of real-time statistics with graphs, etc.? If caching is really well-configured, or at least somehow, provided that it was not there at all, the result should not be long in coming.