Symlex is a lean framework stack for agile Web development based on Symfony and Vuetify. RoadRunner is used as default application server since version 4.4.0. The GitHub repository contains everything to get you started:
Simply delete what you don't need. Since its initial release in 2014, it has proven to be well suited for rapidly building microservices, CLI and single-page applications. It comes complete with working examples from testing to forms and database abstraction.
As published by phpbenchmarks.com, REST requests are more than 40% faster compared to other common PHP frameworks.