We hit a point where improving #PostGraphile V4 further was getting harder, and harder. That’s usually a sign the architecture needs to change rather than the implementation. So we spent some time rebuilding from the ground-up, and the early indications from our community are good - we're so happy to finally have it out in the world!
Power, Performance, Productivity; PostGraphile V5 Published! | PostGraphile

PostGraphile V5 is a ground-up re-architecture with significant enhancements to capability, customizability, extensibility, flexibility, maintainability, performance, and correctness — the result of several years of design, experimentation, and real-world production feedback — while staying true to PostGraphile’s key goal: implementing the obvious so you only write code that delivers true value.