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Sep 17, 2026 · Backend Development

How Deleting 40 Lines of Code Delivered a 400x Speedup: The Hidden Abstraction Tax

A JDK 26 commit replaced reading /proc with a Linux-specific clock_gettime bit manipulation, cutting ThreadMXBean.getCurrentThreadUserTime() latency from 11 µs to 279 ns (40x, 400x under contention), illustrating the "abstraction tax" of portable standards.