Principles for Fast Tokio Applications

One great use of agentic coding is being able to add and very granular tracing instrumentation to help with these sort of optimizations.

All of the significant server applications I have encountered in the industry have suffered from the same problem, which surprised their authors but seemed obvious to me: the application was spending the majority of its CPU time doing meta-work like entering and leaving epoll, stealing work from itself, etc. There are principles for writing Tokio servers and these are good points in the OP but I think they are little-known and too easy to violate.