These gains come on top of already-optimized baselines in kernels that were considered "done" by their authors. The improvements are the direct result of CompileIQ discovering compiler configurations that the default heuristics would never select.
大多数人认为一旦开发者完成优化工作，就没有更多性能提升空间。但作者表明，即使是"完成"的优化代码仍可能通过编译器级别的调整获得显著提升（高达15%），这挑战了开发者对优化极限的认知。
The majority of real-world software benefits from the fast warm-up and performance enhancements provided by the YJIT basic block versioning JIT compiler.
I'm still against frozen-string-literal by default. It is arguable if the string creation limits performance so much in real-world programs. We need to first measure how much Ruby can be faster by frozen-string-literal. If it is not significant, Ruby should prefer dynamics and flexibility.