Recommended and mentioned products
Learn how to build for the web and see where you stand 🌟
For frontend performance testing , I use - https://developers.google.com/web/tools/lighthouse/ & pptr.dev - for more info : web.dev.
An open source load testing tool written in Python.
Some of the tools I use for backend performance testing are - Gatling.io - k6.io - In python : locust.io.