LuTiao Programming

Mar 2, 2026 · Backend Development

How a Targeted Java Refactor Delivered a 10× Performance Boost

By profiling a three‑year‑old order service and applying six data‑driven optimizations—including log reduction, object‑allocation cuts, HashMap replacement, Java 21 virtual threads, JSON caching, and ZGC tuning—the team achieved a 9.5× throughput increase and a ten‑fold drop in P99 latency.