Running well performing php8 application at scale is challenging itself. We gonna start slow and you gonna listen about Php8 JIT compiler configuration and see couple benchmarks. After the JIT we gonna take to another level. Level of developer good practices. With all that knowledge I will guide you on a path of a greenfield application and show the possible pitfalls and hiccups. Finally we gonna take a ride on a roller-coaster of a legacy app that is performance lacking.