There's possibility to perform massive test load to check CX Sales performances?

Summary:

Massive load for performance test

Content (required):

I would know if there's a framework or tool able to test on massive way CX Sales UI's in order to check on performances.

Generally, which is best-practice suggested for performance test of a SaaS?

Version (include the version you are using, if applicable):

21D

Code Snippet (add any code snippets that support your topic, if applicable):