fix: restore original performance comment layout

[mrousavy]

Restores the performance comment presentation from #1583: the original Before / After / Difference HTML tables, alignment, bold faster timings, colored differences, and collapsed All Benchmarks. Each benchmark appears once; the repeated diagnostic tables and long statistical explanation are removed.

Keeps the current measurements, 5% display threshold, visible Promise changes, and exact raw JSON/app artifact links and attempts. Colors indicate observed direction. The only wording departures from the old format avoid claiming unchanged performance, decisive changes, or a future calibration plan.

Validated with all 84 performance-tool tests, the performance-tools typecheck, and scoped Prettier checks. Rendered old and restored comments from real run 34117178949 measurements through GitHub's Markdown API and inspected both collapsed and expanded views; the visible table HTML matches exactly.

The trusted publisher picks up this presentation after it reaches main.

Comment preview using six measurements from run 34117178949, attempt 2

These are existing measurements for the preview, not a benchmark of this PR.

Performance Report

⚠️ Advisory: Results do not fail this PR.

iOS

Benchmark	Before	After	Difference
C++ simpleFunc()	70.2 ns	63.5 ns	🟢 -9.5% faster
Swift number property get/set	130.5 ns	142.4 ns	🔴 +9.18% slower

All Benchmarks

Benchmark	Before	After	Difference
Swift immediatePromise()	1.15 µs	1.12 µs	🟢 -2.51% faster

Android

Benchmark	Before	After	Difference
C++ simpleFunc()	82.9 ns	132.7 ns	🔴 +60.03% slower
Kotlin immediatePromise()	2.63 µs	2.44 µs	🟢 -7.34% faster

All Benchmarks

Benchmark	Before	After	Difference
JavaScript addNumbers()	23.5 ns	23.5 ns	🟢 -0.37% faster

Benchmarking Code Diff 3303893f...16367b7b (view raw output)

Raw measurements: performance-report-2 (JSON artifact). Run 34117178949, attempt 2. Download requires GitHub access.

Android: measurements, attempt 2, apps, attempt 2.
iOS: measurements, attempt 2, apps, attempt 2.

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Project	Deployment	Actions	Updated
nitro-docs	Ready	Preview	Sep 7, 2026 12:36pm UTC

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Performance Report

Report only: Measurements do not fail this PR. Each benchmark has one base/head process pair. Samples describe within-process variation; they do not establish repeatability between launches or statistical confidence.

iOS

Benchmark	Base p50	Head p50	Observed change
JavaScript addNumbers()	38.8 ns	51.5 ns	+32.78% slower
C++ bounce(1 MiB)	501.1 ns	584.3 ns	+16.61% slower
C++ bounce(4 KiB)	577.9 ns	508.4 ns	-12.03% faster
C++ bounce native-owned buffer (1 MiB)	5.88 µs	6.24 µs	+6.2% slower
C++ bounce native-owned buffer (4 KiB)	748.2 ns	705.6 ns	-5.7% faster
C++ copy(1 MiB)	127.98 µs	94.54 µs	-26.13% faster
C++ synchronousCallback()	335.0 ns	397.4 ns	+18.62% slower
C++ create()	945.3 ns	677.7 ns	-28.31% faster
C++ returnExisting()	316.6 ns	367.9 ns	+16.21% slower
C++ optional trailing string	285.2 ns	310.1 ns	+8.72% slower
C++ addNumbers()	163.2 ns	154.4 ns	-5.39% faster
C++ deferred worker Promise (includes trigger call)	25.78 µs	30.15 µs	+16.98% slower
C++ immediatePromise()	1.60 µs	1.68 µs	+5.24% slower
C++ Unicode string	528.2 ns	587.3 ns	+11.19% slower
C++ number	string variant	217.2 ns	228.3 ns
Swift bounce(4 KiB)	433.1 ns	558.2 ns	+28.89% slower
Swift bounce native-owned buffer (4 KiB)	1.03 µs	684.3 ns	-33.58% faster
Swift copy(1 MiB)	128.20 µs	115.77 µs	-9.69% faster
Swift copy(4 KiB)	2.55 µs	2.30 µs	-9.85% faster
Swift large array (1,024)	83.25 µs	89.17 µs	+7.11% slower
Swift synchronousCallback()	645.7 ns	564.7 ns	-12.54% faster
Swift create()	40.06 µs	48.50 µs	+21.08% slower
Swift optional trailing string	311.3 ns	261.3 ns	-16.06% faster
Swift addNumbers()	152.1 ns	163.3 ns	+7.36% slower
Swift simpleFunc()	142.5 ns	133.3 ns	-6.5% faster
Swift deferred worker Promise (includes trigger call)	28.73 µs	33.28 µs	+15.84% slower
Swift immediatePromise()	2.70 µs	2.94 µs	+8.79% slower
Swift number property get/set	274.1 ns	298.2 ns	+8.81% slower
Swift Unicode string	694.1 ns	733.2 ns	+5.64% slower
Swift nested Car struct	4.14 µs	5.20 µs	+25.49% slower
Swift number	string variant	371.2 ns	331.2 ns

All benchmarks and sample variation

Benchmark	Base p50	Head p50	Observed change
JavaScript addNumbers()	38.8 ns	51.5 ns	+32.78% slower
C++ bounce(1 MiB)	501.1 ns	584.3 ns	+16.61% slower
C++ bounce(4 KiB)	577.9 ns	508.4 ns	-12.03% faster
C++ bounce native-owned buffer (1 MiB)	5.88 µs	6.24 µs	+6.2% slower
C++ bounce native-owned buffer (4 KiB)	748.2 ns	705.6 ns	-5.7% faster
C++ copy(1 MiB)	127.98 µs	94.54 µs	-26.13% faster
C++ copy(4 KiB)	1.93 µs	1.85 µs	-4.15% faster
C++ large array (1,024)	79.98 µs	81.61 µs	+2.04% slower
C++ small array (16)	1.56 µs	1.56 µs	+0.29% slower
C++ synchronousCallback()	335.0 ns	397.4 ns	+18.62% slower
C++ create()	945.3 ns	677.7 ns	-28.31% faster
C++ returnExisting()	316.6 ns	367.9 ns	+16.21% slower
C++ typed map (8 entries)	3.12 µs	3.00 µs	-4.12% faster
C++ optional trailing string	285.2 ns	310.1 ns	+8.72% slower
C++ addNumbers()	163.2 ns	154.4 ns	-5.39% faster
C++ simpleFunc()	158.5 ns	152.9 ns	-3.51% faster
C++ deferred worker Promise (includes trigger call)	25.78 µs	30.15 µs	+16.98% slower
C++ immediatePromise()	1.60 µs	1.68 µs	+5.24% slower
C++ number property get/set	262.2 ns	265.1 ns	+1.13% slower
C++ short ASCII string	271.8 ns	263.4 ns	-3.08% faster
C++ Unicode string	528.2 ns	587.3 ns	+11.19% slower
C++ nested Car struct	4.26 µs	4.24 µs	-0.39% faster
C++ number	string variant	217.2 ns	228.3 ns
Swift bounce(1 MiB)	643.5 ns	666.3 ns	+3.54% slower
Swift bounce(4 KiB)	433.1 ns	558.2 ns	+28.89% slower
Swift bounce native-owned buffer (1 MiB)	7.70 µs	7.38 µs	-4.08% faster
Swift bounce native-owned buffer (4 KiB)	1.03 µs	684.3 ns	-33.58% faster
Swift copy(1 MiB)	128.20 µs	115.77 µs	-9.69% faster
Swift copy(4 KiB)	2.55 µs	2.30 µs	-9.85% faster
Swift large array (1,024)	83.25 µs	89.17 µs	+7.11% slower
Swift small array (16)	1.65 µs	1.66 µs	+0.75% slower
Swift synchronousCallback()	645.7 ns	564.7 ns	-12.54% faster
Swift create()	40.06 µs	48.50 µs	+21.08% slower
Swift returnExisting()	469.4 ns	453.5 ns	-3.38% faster
Swift typed map (8 entries)	5.63 µs	5.40 µs	-4% faster
Swift optional trailing string	311.3 ns	261.3 ns	-16.06% faster
Swift addNumbers()	152.1 ns	163.3 ns	+7.36% slower
Swift simpleFunc()	142.5 ns	133.3 ns	-6.5% faster
Swift deferred worker Promise (includes trigger call)	28.73 µs	33.28 µs	+15.84% slower
Swift immediatePromise()	2.70 µs	2.94 µs	+8.79% slower
Swift number property get/set	274.1 ns	298.2 ns	+8.81% slower
Swift short ASCII string	294.0 ns	300.6 ns	+2.24% slower
Swift Unicode string	694.1 ns	733.2 ns	+5.64% slower
Swift nested Car struct	4.14 µs	5.20 µs	+25.49% slower
Swift number	string variant	371.2 ns	331.2 ns
TurboModule addNumbers()	1.89 µs	1.84 µs	-2.82% faster

Benchmark	Base process p50	Head process p50	Paired changes	Sample MAD / p50 (base, head)
JavaScript addNumbers()	38.8 ns	51.5 ns	+32.78% slower	6.5%, 17.0%
C++ bounce(1 MiB)	501.1 ns	584.3 ns	+16.61% slower	8.3%, 8.5%
C++ bounce(4 KiB)	577.9 ns	508.4 ns	-12.03% faster	7.6%, 12.7%
C++ bounce native-owned buffer (1 MiB)	5.88 µs	6.24 µs	+6.2% slower	5.2%, 3.7%
C++ bounce native-owned buffer (4 KiB)	748.2 ns	705.6 ns	-5.7% faster	4.0%, 3.9%
C++ copy(1 MiB)	127.98 µs	94.54 µs	-26.13% faster	7.3%, 5.1%
C++ copy(4 KiB)	1.93 µs	1.85 µs	-4.15% faster	8.3%, 9.3%
C++ large array (1,024)	79.98 µs	81.61 µs	+2.04% slower	4.5%, 8.4%
C++ small array (16)	1.56 µs	1.56 µs	+0.29% slower	5.5%, 4.1%
C++ synchronousCallback()	335.0 ns	397.4 ns	+18.62% slower	9.3%, 9.0%
C++ create()	945.3 ns	677.7 ns	-28.31% faster	13.3%, 7.7%
C++ returnExisting()	316.6 ns	367.9 ns	+16.21% slower	4.6%, 5.0%
C++ typed map (8 entries)	3.12 µs	3.00 µs	-4.12% faster	4.0%, 4.2%
C++ optional trailing string	285.2 ns	310.1 ns	+8.72% slower	7.8%, 5.4%
C++ addNumbers()	163.2 ns	154.4 ns	-5.39% faster	9.8%, 7.0%
C++ simpleFunc()	158.5 ns	152.9 ns	-3.51% faster	9.0%, 5.3%
C++ deferred worker Promise (includes trigger call)	25.78 µs	30.15 µs	+16.98% slower	7.2%, 8.8%
C++ immediatePromise()	1.60 µs	1.68 µs	+5.24% slower	8.8%, 8.9%
C++ number property get/set	262.2 ns	265.1 ns	+1.13% slower	8.2%, 7.3%
C++ short ASCII string	271.8 ns	263.4 ns	-3.08% faster	4.5%, 5.4%
C++ Unicode string	528.2 ns	587.3 ns	+11.19% slower	5.1%, 5.4%
C++ nested Car struct	4.26 µs	4.24 µs	-0.39% faster	5.9%, 5.6%
C++ number	string variant	217.2 ns	228.3 ns	+5.13% slower
Swift bounce(1 MiB)	643.5 ns	666.3 ns	+3.54% slower	7.7%, 9.8%
Swift bounce(4 KiB)	433.1 ns	558.2 ns	+28.89% slower	3.5%, 5.9%
Swift bounce native-owned buffer (1 MiB)	7.70 µs	7.38 µs	-4.08% faster	19.1%, 6.5%
Swift bounce native-owned buffer (4 KiB)	1.03 µs	684.3 ns	-33.58% faster	4.4%, 6.4%
Swift copy(1 MiB)	128.20 µs	115.77 µs	-9.69% faster	11.5%, 14.1%
Swift copy(4 KiB)	2.55 µs	2.30 µs	-9.85% faster	10.6%, 10.8%
Swift large array (1,024)	83.25 µs	89.17 µs	+7.11% slower	9.2%, 8.0%
Swift small array (16)	1.65 µs	1.66 µs	+0.75% slower	5.5%, 4.0%
Swift synchronousCallback()	645.7 ns	564.7 ns	-12.54% faster	11.5%, 13.7%
Swift create()	40.06 µs	48.50 µs	+21.08% slower	3.3%, 9.0%
Swift returnExisting()	469.4 ns	453.5 ns	-3.38% faster	6.7%, 4.2%
Swift typed map (8 entries)	5.63 µs	5.40 µs	-4% faster	5.7%, 7.8%
Swift optional trailing string	311.3 ns	261.3 ns	-16.06% faster	5.8%, 2.8%
Swift addNumbers()	152.1 ns	163.3 ns	+7.36% slower	7.2%, 4.0%
Swift simpleFunc()	142.5 ns	133.3 ns	-6.5% faster	3.6%, 6.1%
Swift deferred worker Promise (includes trigger call)	28.73 µs	33.28 µs	+15.84% slower	9.3%, 11.6%
Swift immediatePromise()	2.70 µs	2.94 µs	+8.79% slower	8.2%, 9.2%
Swift number property get/set	274.1 ns	298.2 ns	+8.81% slower	6.3%, 4.4%
Swift short ASCII string	294.0 ns	300.6 ns	+2.24% slower	5.3%, 7.8%
Swift Unicode string	694.1 ns	733.2 ns	+5.64% slower	4.2%, 6.2%
Swift nested Car struct	4.14 µs	5.20 µs	+25.49% slower	5.9%, 7.7%
Swift number	string variant	371.2 ns	331.2 ns	-10.79% faster
TurboModule addNumbers()	1.89 µs	1.84 µs	-2.82% faster	5.1%, 8.0%

p50 is the median of timed batch averages in ns/op, not individual-call latency. MAD describes sample spread; ordered raw samples retain within-process drift.

Android

Benchmark	Base p50	Head p50	Observed change
C++ copy(4 KiB)	1.30 µs	1.19 µs	-8.81% faster
C++ large array (1,024)	46.46 µs	49.84 µs	+7.27% slower
C++ small array (16)	1.12 µs	1.01 µs	-10.08% faster
C++ addNumbers()	110.9 ns	104.7 ns	-5.57% faster
C++ simpleFunc()	104.5 ns	91.2 ns	-12.7% faster
C++ deferred worker Promise (includes trigger call)	36.68 µs	45.08 µs	+22.9% slower
C++ short ASCII string	186.8 ns	173.4 ns	-7.17% faster
Kotlin bounce native-owned buffer (4 KiB)	1.61 µs	1.77 µs	+10.22% slower
Kotlin large array (1,024)	61.18 µs	55.70 µs	-8.96% faster
Kotlin synchronousCallback()	1.52 µs	1.42 µs	-6.75% faster
Kotlin number property get/set	312.1 ns	295.4 ns	-5.33% faster

All benchmarks and sample variation

Benchmark	Base p50	Head p50	Observed change
JavaScript addNumbers()	26.8 ns	26.7 ns	-0.53% faster
C++ bounce(1 MiB)	590.2 ns	599.2 ns	+1.53% slower
C++ bounce(4 KiB)	615.9 ns	593.6 ns	-3.61% faster
C++ bounce native-owned buffer (1 MiB)	4.38 µs	4.43 µs	+1.14% slower
C++ bounce native-owned buffer (4 KiB)	575.2 ns	599.6 ns	+4.24% slower
C++ copy(1 MiB)	45.01 µs	43.78 µs	-2.73% faster
C++ copy(4 KiB)	1.30 µs	1.19 µs	-8.81% faster
C++ large array (1,024)	46.46 µs	49.84 µs	+7.27% slower
C++ small array (16)	1.12 µs	1.01 µs	-10.08% faster
C++ synchronousCallback()	440.7 ns	440.1 ns	-0.12% faster
C++ create()	742.2 ns	737.9 ns	-0.58% faster
C++ returnExisting()	273.2 ns	265.6 ns	-2.8% faster
C++ typed map (8 entries)	2.20 µs	2.19 µs	-0.05% faster
C++ optional trailing string	188.7 ns	187.9 ns	-0.4% faster
C++ addNumbers()	110.9 ns	104.7 ns	-5.57% faster
C++ simpleFunc()	104.5 ns	91.2 ns	-12.7% faster
C++ deferred worker Promise (includes trigger call)	36.68 µs	45.08 µs	+22.9% slower
C++ immediatePromise()	975.6 ns	991.1 ns	+1.58% slower
C++ number property get/set	180.0 ns	181.2 ns	+0.71% slower
C++ short ASCII string	186.8 ns	173.4 ns	-7.17% faster
C++ Unicode string	343.8 ns	341.8 ns	-0.59% faster
C++ nested Car struct	2.77 µs	2.76 µs	-0.14% faster
C++ number	string variant	168.9 ns	168.6 ns
Kotlin bounce(1 MiB)	1.55 µs	1.52 µs	-2.47% faster
Kotlin bounce(4 KiB)	1.56 µs	1.52 µs	-2.7% faster
Kotlin bounce native-owned buffer (1 MiB)	5.90 µs	5.68 µs	-3.62% faster
Kotlin bounce native-owned buffer (4 KiB)	1.61 µs	1.77 µs	+10.22% slower
Kotlin copy(1 MiB)	398.59 µs	403.05 µs	+1.12% slower
Kotlin copy(4 KiB)	8.71 µs	8.39 µs	-3.75% faster
Kotlin large array (1,024)	61.18 µs	55.70 µs	-8.96% faster
Kotlin small array (16)	1.42 µs	1.41 µs	-0.4% faster
Kotlin synchronousCallback()	1.52 µs	1.42 µs	-6.75% faster
Kotlin create()	2.24 µs	2.22 µs	-0.67% faster
Kotlin returnExisting()	760.7 ns	754.2 ns	-0.85% faster
Kotlin typed map (8 entries)	9.66 µs	9.74 µs	+0.81% slower
Kotlin optional trailing string	408.1 ns	402.2 ns	-1.45% faster
Kotlin addNumbers()	150.5 ns	147.6 ns	-1.94% faster
Kotlin simpleFunc()	125.8 ns	131.5 ns	+4.46% slower
Kotlin deferred worker Promise (includes trigger call)	58.72 µs	58.63 µs	-0.15% faster
Kotlin immediatePromise()	3.01 µs	2.94 µs	-2.07% faster
Kotlin number property get/set	312.1 ns	295.4 ns	-5.33% faster
Kotlin short ASCII string	581.6 ns	571.6 ns	-1.72% faster
Kotlin Unicode string	947.3 ns	948.9 ns	+0.17% slower
Kotlin nested Car struct	6.69 µs	6.78 µs	+1.4% slower
Kotlin number	string variant	512.5 ns	512.8 ns
TurboModule addNumbers()	302.7 ns	300.3 ns	-0.82% faster

Benchmark	Base process p50	Head process p50	Paired changes	Sample MAD / p50 (base, head)
JavaScript addNumbers()	26.8 ns	26.7 ns	-0.53% faster	0.8%, 0.4%
C++ bounce(1 MiB)	590.2 ns	599.2 ns	+1.53% slower	13.9%, 12.0%
C++ bounce(4 KiB)	615.9 ns	593.6 ns	-3.61% faster	15.4%, 14.8%
C++ bounce native-owned buffer (1 MiB)	4.38 µs	4.43 µs	+1.14% slower	0.9%, 1.0%
C++ bounce native-owned buffer (4 KiB)	575.2 ns	599.6 ns	+4.24% slower	0.3%, 3.1%
C++ copy(1 MiB)	45.01 µs	43.78 µs	-2.73% faster	2.1%, 0.9%
C++ copy(4 KiB)	1.30 µs	1.19 µs	-8.81% faster	1.6%, 1.3%
C++ large array (1,024)	46.46 µs	49.84 µs	+7.27% slower	0.5%, 1.5%
C++ small array (16)	1.12 µs	1.01 µs	-10.08% faster	1.9%, 0.7%
C++ synchronousCallback()	440.7 ns	440.1 ns	-0.12% faster	8.1%, 6.0%
C++ create()	742.2 ns	737.9 ns	-0.58% faster	3.5%, 3.0%
C++ returnExisting()	273.2 ns	265.6 ns	-2.8% faster	3.4%, 1.0%
C++ typed map (8 entries)	2.20 µs	2.19 µs	-0.05% faster	0.7%, 0.3%
C++ optional trailing string	188.7 ns	187.9 ns	-0.4% faster	1.5%, 0.7%
C++ addNumbers()	110.9 ns	104.7 ns	-5.57% faster	5.6%, 0.5%
C++ simpleFunc()	104.5 ns	91.2 ns	-12.7% faster	3.1%, 0.8%
C++ deferred worker Promise (includes trigger call)	36.68 µs	45.08 µs	+22.9% slower	1.8%, 14.1%
C++ immediatePromise()	975.6 ns	991.1 ns	+1.58% slower	1.0%, 2.0%
C++ number property get/set	180.0 ns	181.2 ns	+0.71% slower	0.7%, 0.7%
C++ short ASCII string	186.8 ns	173.4 ns	-7.17% faster	2.8%, 3.3%
C++ Unicode string	343.8 ns	341.8 ns	-0.59% faster	1.5%, 0.3%
C++ nested Car struct	2.77 µs	2.76 µs	-0.14% faster	0.7%, 1.5%
C++ number	string variant	168.9 ns	168.6 ns	-0.19% faster
Kotlin bounce(1 MiB)	1.55 µs	1.52 µs	-2.47% faster	6.3%, 4.6%
Kotlin bounce(4 KiB)	1.56 µs	1.52 µs	-2.7% faster	5.9%, 6.3%
Kotlin bounce native-owned buffer (1 MiB)	5.90 µs	5.68 µs	-3.62% faster	0.8%, 1.3%
Kotlin bounce native-owned buffer (4 KiB)	1.61 µs	1.77 µs	+10.22% slower	1.7%, 4.5%
Kotlin copy(1 MiB)	398.59 µs	403.05 µs	+1.12% slower	2.7%, 2.4%
Kotlin copy(4 KiB)	8.71 µs	8.39 µs	-3.75% faster	4.6%, 2.9%
Kotlin large array (1,024)	61.18 µs	55.70 µs	-8.96% faster	1.9%, 1.7%
Kotlin small array (16)	1.42 µs	1.41 µs	-0.4% faster	1.6%, 1.0%
Kotlin synchronousCallback()	1.52 µs	1.42 µs	-6.75% faster	4.3%, 2.6%
Kotlin create()	2.24 µs	2.22 µs	-0.67% faster	2.1%, 2.9%
Kotlin returnExisting()	760.7 ns	754.2 ns	-0.85% faster	1.9%, 0.8%
Kotlin typed map (8 entries)	9.66 µs	9.74 µs	+0.81% slower	1.0%, 1.3%
Kotlin optional trailing string	408.1 ns	402.2 ns	-1.45% faster	1.9%, 0.8%
Kotlin addNumbers()	150.5 ns	147.6 ns	-1.94% faster	0.9%, 0.6%
Kotlin simpleFunc()	125.8 ns	131.5 ns	+4.46% slower	0.7%, 0.5%
Kotlin deferred worker Promise (includes trigger call)	58.72 µs	58.63 µs	-0.15% faster	2.6%, 2.5%
Kotlin immediatePromise()	3.01 µs	2.94 µs	-2.07% faster	2.9%, 1.3%
Kotlin number property get/set	312.1 ns	295.4 ns	-5.33% faster	0.9%, 0.4%
Kotlin short ASCII string	581.6 ns	571.6 ns	-1.72% faster	1.1%, 1.2%
Kotlin Unicode string	947.3 ns	948.9 ns	+0.17% slower	1.8%, 2.3%
Kotlin nested Car struct	6.69 µs	6.78 µs	+1.4% slower	1.1%, 1.0%
Kotlin number	string variant	512.5 ns	512.8 ns	+0.06% slower
TurboModule addNumbers()	302.7 ns	300.3 ns	-0.82% faster	1.8%, 1.0%

p50 is the median of timed batch averages in ns/op, not individual-call latency. MAD describes sample spread; ordered raw samples retain within-process drift.

Benchmarking Code Diff 3303893f...a81cec41 (view CI run)

Raw measurements: performance-report-1 (JSON artifact). Run 34122713124, attempt 1. Download requires GitHub access.

Android: measurements, attempt 1, apps, attempt 1.
iOS: measurements, attempt 1, apps, attempt 1.