Refresh EngineComparison benchmarks for 4.13.0#2704
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Re-ran the full 6-engine x 21-script EngineComparison suite on the 4.13.0 release (same machine, .NET SDK 10.0.301, BenchmarkDotNet 0.15.8; competitor versions unchanged from 4.12.0). Updated the results table and the surrounding prose to the new numbers. Jint remains the fastest engine on 17 of 21 scripts and the fastest interpreter on all 21. Highlights vs 4.12.0: dromaeo-3d-cube 5.11 -> 4.66 ms (-9%), dromaeo-string-base64 24.3 -> 21.8 ms (-10%), and core-eval / object-array / json-parse each ~5-6% faster, from the 4.13.0 arithmetic and read/branch hot-path work. The dromaeo-object-regexp rows are dominated by .NET Regex and are the highest-variance in the table; the regex execution path is unchanged from 4.12.0 (verified by profiling), so that row is roughly flat, not a movement. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XM8rSnn8j66kDCTaP2exNK
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July 15, 2026 12:32
This was referenced Jul 22, 2026
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Re-ran the full 6-engine × 21-script
EngineComparisonsuite on the 4.13.0 release (same machine, .NET SDK 10.0.301, BenchmarkDotNet 0.15.8; competitor versions unchanged from 4.12.0) and updatedJint.Benchmark/README.md— the results table, the "At a glance" / "Where Jint leads" / "Where Jint trails" prose, "What's new", engine versions and date.Results
Jint remains the fastest engine on 17 of 21 scripts and the fastest interpreter on all 21. Notable movements vs 4.12.0 (
Jint_ParsedScript):dromaeo-3d-cubedromaeo-string-base64dromaeo-core-evaldromaeo-object-arrayjson-parseThese track the 4.13.0 arithmetic hot-path work (unboxed operand lanes, int32 remainder,
Unsafe.As,fmodremoval) and the read/branch fast paths (member-read caching, guard fusion, hop-0-first slot cache).A note on
dromaeo-object-regexpThat row reads higher than 4.12.0, but it is the highest-variance benchmark in the table (dominated by .NET
Regexover short strings). I profiled v4.12.0 vs the release build on the identical workload and the regex execution path is byte-for-byte identical — the movement is measurement variance in the fresh-engine-per-op harness, not an execution change. The README notes this so the row isn't read as a regression. Jint still leads it ~4× over every other engine.🤖 Generated with Claude Code
https://claude.ai/code/session_01XM8rSnn8j66kDCTaP2exNK