WASM single-stream throughput: raw run data
Hardware: Apple M4 Pro (24 GB), 14 cores (10P + 4E), macOS 15.6.1
Build: emcc 5.0.7, -O3 -msimd128 -ffast-math, -sENVIRONMENT=web,node
WASM source: wasm/microgpt_inf.c (post RMSNorm-eps fix)
Methodology: 100,000 forward passes per run, after 20,000-token warmup,
              elapsed time from emscripten_get_now() (wraps performance.now)

The number depends on the browser and host context. Two environments measured:

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Environment A: regular Chrome (typical user-facing number)
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Mean of 5 runs: 1,341,206 tok/sec
CV:             0.18%

This is what most readers will see when they open the live demo in their
own browser. Used as the headline number in README and report.

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Environment B: Chromium 146 / Electron 41.3.0 inside Claude Code preview
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Session 1 (5 runs):
  1,976,285 / 2,044,990 / 2,040,816 / 2,049,180 / 2,044,990
  mean: 2,031,252  CV: 1.36%

Session 2 (5 runs):
  2,049,180 / 2,044,990 / 2,049,180 / 2,032,520 / 2,049,180
  mean: 2,045,010

Combined mean (10 runs): 2,038,131  range: 1,976,285 — 2,049,180

The Electron-embedded Chromium runs noticeably faster than a normal Chrome
browser on the same machine — likely a different V8 build / different
sandbox / different scheduling. Reported separately; not used as the
published headline because most readers won't see it.

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Numpy reference cross-check (verify_against_numpy.py)
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Verified live by `python3 wasm/verify_against_numpy.py`:
  - First-token logits: max |diff| ≈ 1e-6, argmax matches
  - Autoregressive trace ('emma'): all positions match within fp32 noise

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To reproduce
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   cd wasm && ./build.sh
   python3 -m http.server 8765
   # open http://localhost:8765 in regular Chrome and click "Benchmark"