← Wednesday, September 30, 2026Performance & OSBenchmark

Rust compiler wall time fell 4.57% across 629 measurements in two months

nnethercote.github.io 5 min read Editor score 8/10

Of 629 benchmark measurements, 555 improved; PGO cut Clippy wall time by as much as 18%, and an LLVM update reduced the mean by 1.2%. The results show how compiler changes translate into measurable developer-tool performance.

What

Rust compiler wall time fell by a mean 4.57% across measurements from 2026-07-29 to 2026-09-28.

How

Of 629 benchmark measurements, 555 improved and 74 regressed; changes included Clippy PGO, LLVM 23, and optimizations to Polonius Alpha.

Why it matters

The results show how broad performance gains can outweigh regressions from new analyses, while targeted hot-path work can help contain their costs.

Read on nnethercote.github.io → Lobsters

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