Optimize prod browser output by ScriptedAlchemy · Pull Request #85 · rstackjs/rsbuild-plugin-react-router

ScriptedAlchemy · 2026-07-08T17:48:38Z

Summary

Enable production-only Rspack browser output size optimizations: mangleExports: 'size', usedExports: 'global', and shorter async chunk filenames with [id]-[contenthash:16].
Add build output bundle-size collection to benchmark runs.
Surface client JS gzip and total gzip metrics in benchmark JSON, Markdown, CI reports, and compare output.

Validation

pnpm test:core tests/index.test.ts tests/benchmark-fixture.test.ts
pnpm build
pnpm test:core
pnpm bench:smoke
pnpm prettier --check src/index.ts tests/index.test.ts tests/benchmark-fixture.test.ts scripts/bench-builds.mts scripts/benchmark/results.mts scripts/compare-benchmarks.mts scripts/benchmark/ci-report-model.mjs scripts/benchmark/ci-report-markdown.mjs
git diff --check

Note: repo-wide pnpm format:check still fails on pre-existing untouched src/export-utils.ts formatting.

pkg-pr-new · 2026-07-08T17:49:24Z

pnpm add https://pkg.pr.new/rsbuild-plugin-react-router@0dcfc93

commit: 0dcfc93

github-actions · 2026-07-08T18:28:50Z

Benchmark Results

Compared PR head 0dcfc93 against base 7bb55da.

Reading benchmark confidence

Raw deltas are always shown. The signal label only indicates whether the observed median delta is larger than a robust run-to-run noise band; it does not erase or replace the measurement.

The noise band is the larger of 2% or two combined robust standard deviations estimated from each side's relative median absolute deviation (rMAD). Fewer than three finite samples is reported as insufficient data. An inconclusive result should be rerun or investigated from the uploaded raw samples before drawing a performance conclusion.

Benchmark	Runs	Base total	Head total	Delta	Base rMAD	Head rMAD	Noise band	Signal
`large-355-ssr-esm (build)`	3	9.05s	8.76s	-3.2%	0.4%	0.3%	±2.0%	🟢 improvement
`synthetic-1024-ssr-esm (build)`	3	4.28s	4.27s	-0.3%	1.1%	0.3%	±3.5%	⚪ inconclusive
`synthetic-1024-ssr-esm-split (build)`	3	5.77s	5.73s	-0.8%	1.0%	0.0%	±3.1%	⚪ inconclusive
`synthetic-256-sourcemaps (build)`	5	2.22s	2.18s	-1.6%	1.8%	0.2%	±5.3%	⚪ inconclusive
`synthetic-256-ssr-esm (build)`	5	2.05s	2.03s	-0.7%	0.6%	1.0%	±3.5%	⚪ inconclusive
`synthetic-256-ssr-esm-split (build)`	5	2.43s	2.46s	+0.9%	0.9%	0.4%	±3.0%	⚪ inconclusive
`synthetic-48-ssr-esm (build)`	5	1.36s	1.32s	-2.8%	0.3%	0.7%	±2.3%	🟢 improvement
`large-355-ssr-esm (dev)`	3	15.91s	16.71s	+5.1%	1.8%	0.2%	±5.5%	⚪ inconclusive
`synthetic-1024-ssr-esm (dev)`	3	5.25s	4.80s	-8.5%	5.3%	1.4%	±16.2%	⚪ inconclusive
`synthetic-1024-ssr-esm-split (dev)`	3	4.94s	4.78s	-3.4%	0.5%	0.4%	±2.0%	🟢 improvement
`synthetic-256-sourcemaps (dev)`	5	2.04s	2.12s	+3.8%	0.6%	0.9%	±3.2%	🔴 regression
`synthetic-256-ssr-esm (dev)`	5	1.82s	1.81s	-0.1%	0.7%	2.1%	±6.6%	⚪ inconclusive
`synthetic-256-ssr-esm-split (dev)`	5	1.79s	1.77s	-1.3%	0.2%	2.8%	±8.2%	⚪ inconclusive
`synthetic-48-ssr-esm (dev)`	5	0.94s	0.92s	-1.7%	1.4%	0.2%	±4.3%	⚪ inconclusive
`complex app (cold)`	3	96.12s	115.86s	+20.5%	1.1%	0.5%	±3.5%	🔴 regression
`complex app (dev)`	3	88.52s	85.66s	-3.2%	1.9%	0.5%	±5.8%	⚪ inconclusive
`complex app (warm)`	3	68.51s	72.00s	+5.1%	0.6%	2.6%	±7.9%	⚪ inconclusive

Dev Rollup

Group	Fixtures	Base total	Head total	Delta	Base ready	Head ready	Ready delta	Base routes	Head routes	Route delta	Base update/HMR	Head update/HMR	Update delta	Speedup
All dev fixtures	7	32.68s	32.91s	+0.7%	19.89s	19.42s	-2.3%	4.11s	4.01s	-2.6%	3.02s	2.86s	-5.3%	0.99x
Large app	1	15.91s	16.71s	+5.1%	8.44s	8.29s	-1.8%	2.04s	1.97s	-3.5%	1.77s	1.72s	-3.0%	0.95x
Standard fixtures	6	16.77s	16.19s	-3.5%	11.44s	11.13s	-2.7%	2.07s	2.04s	-1.7%	1.24s	1.14s	-8.5%	1.04x

Production Build Benchmarks

Rendered 7 production build benchmarks.

Benchmark	Runs	Base total	Head total	Delta	Head mean	Head p95	Speedup	Head RSS p95	Head client JS gzip	Client JS gzip delta	Head total gzip
`large-355-ssr-esm`	3	9.05s	8.76s	-3.2%	8.77s	8.80s	1.03x	1491 MB	5.0 MB	+0.2%	14.8 MB
`synthetic-1024-ssr-esm`	3	4.28s	4.27s	-0.3%	4.24s	4.28s	1.00x	620 MB	626.1 kB	-4.1%	1.4 MB
`synthetic-1024-ssr-esm-split`	3	5.77s	5.73s	-0.8%	5.71s	5.73s	1.01x	824 MB	927.8 kB	-2.5%	1.7 MB
`synthetic-256-sourcemaps`	5	2.22s	2.18s	-1.6%	2.17s	2.19s	1.02x	437 MB	228.7 kB	-2.9%	1.4 MB
`synthetic-256-ssr-esm`	5	2.05s	2.03s	-0.7%	2.03s	2.06s	1.01x	412 MB	228.7 kB	-2.9%	918.8 kB
`synthetic-256-ssr-esm-split`	5	2.43s	2.46s	+0.9%	2.45s	2.47s	0.99x	441 MB	305.6 kB	-1.9%	998.3 kB
`synthetic-48-ssr-esm`	5	1.36s	1.32s	-2.8%	1.32s	1.33s	1.03x	301 MB	121.9 kB	-1.1%	763.9 kB

ci-small+ci-large Dev Fixture Summary

Rendered 7 dev benchmark fixtures from the ci-small+ci-large profile.

Benchmark	Runs	Base total	Head total	Delta	Base ready	Head ready	Base routes	Head routes	Base update/HMR	Head update/HMR	Update delta	Head mean	Head p95	Speedup	Head RSS p95
`large-355-ssr-esm`	3	15.91s	16.71s	+5.1%	8.44s	8.29s	2.04s	1.97s	1.77s	1.72s	-3.0%	16.33s	16.75s	0.95x	-
`synthetic-1024-ssr-esm`	3	5.25s	4.80s	-8.5%	3.46s	3.30s	0.61s	0.58s	0.38s	0.35s	-7.6%	4.77s	4.87s	1.09x	-
`synthetic-1024-ssr-esm-split`	3	4.94s	4.78s	-3.4%	3.39s	3.30s	0.61s	0.60s	0.38s	0.35s	-7.5%	4.78s	4.79s	1.03x	-
`synthetic-256-sourcemaps`	5	2.04s	2.12s	+3.8%	1.46s	1.46s	0.25s	0.24s	0.15s	0.13s	-15.7%	2.08s	2.13s	0.96x	-
`synthetic-256-ssr-esm`	5	1.82s	1.81s	-0.1%	1.25s	1.24s	0.25s	0.25s	0.13s	0.13s	+0.4%	1.82s	1.86s	1.00x	-
`synthetic-256-ssr-esm-split`	5	1.79s	1.77s	-1.3%	1.24s	1.21s	0.23s	0.24s	0.15s	0.13s	-16.6%	1.79s	1.84s	1.01x	-
`synthetic-48-ssr-esm`	5	0.94s	0.92s	-1.7%	0.65s	0.63s	0.12s	0.12s	0.05s	0.05s	-0.0%	0.92s	0.94s	1.02x	-

large-355-ssr-esm Plugin Operations

Environment	Operation	Count	Base total	Head total	Delta	Head wall	Head max	Reports
web	`route:module`	1071	1144.9ms	1030.4ms	-10.0%	1030.4ms	28.5ms	6
node	`route:module`	1071	576.3ms	606.3ms	+5.2%	606.3ms	18.4ms	6
web	`route:client-entry`	1071	286.6ms	268.9ms	-6.2%	268.9ms	5.1ms	6
node	`manifest:transform`	3	75.3ms	56.6ms	-24.8%	56.6ms	20.2ms	3
web	`manifest:stage`	9	11.6ms	11.7ms	+0.9%	11.7ms	1.9ms	9
web	`manifest:transform`	3	0.3ms	0.3ms	0.0%	0.3ms	0.1ms	3

synthetic-1024-ssr-esm Plugin Operations

Environment	Operation	Count	Base total	Head total	Delta	Head wall	Head max	Reports
web	`route:module`	3078	1312.2ms	1257.3ms	-4.2%	1257.3ms	13.7ms	6
node	`route:module`	3078	557.4ms	566.2ms	+1.6%	566.2ms	6.3ms	6
web	`route:client-entry`	3078	388.6ms	420.8ms	+8.3%	420.8ms	7.6ms	6
node	`module:client-only-stub`	3	153.3ms	105.6ms	-31.1%	105.6ms	50.3ms	3
node	`manifest:transform`	3	132.9ms	125.8ms	-5.3%	125.8ms	43.3ms	3
web	`manifest:stage`	9	45.9ms	42.1ms	-8.3%	42.1ms	8.1ms	9
web	`manifest:transform`	3	0.3ms	0.3ms	0.0%	0.3ms	0.1ms	3

synthetic-1024-ssr-esm-split Plugin Operations

Environment	Operation	Count	Base total	Head total	Delta	Head wall	Head max	Reports
web	`route:module`	3078	1258.6ms	1255.8ms	-0.2%	1255.8ms	25.0ms	6
node	`route:module`	3078	585.5ms	593.9ms	+1.4%	593.9ms	8.3ms	6
node	`module:client-only-stub`	3	453.7ms	263.2ms	-42.0%	263.2ms	216.5ms	3
web	`route:client-entry`	3078	399.9ms	408.2ms	+2.1%	408.2ms	8.2ms	6
node	`manifest:transform`	3	126.9ms	125.8ms	-0.9%	125.8ms	43.6ms	3
web	`manifest:stage`	9	43.2ms	39.4ms	-8.8%	39.4ms	8.1ms	9
web	`manifest:transform`	3	0.3ms	0.3ms	0.0%	0.3ms	0.1ms	3

synthetic-256-sourcemaps Plugin Operations

Environment	Operation	Count	Base total	Head total	Delta	Head wall	Head max	Reports
web	`route:module`	1291	715.0ms	737.6ms	+3.2%	737.6ms	23.8ms	11
node	`route:module`	1290	312.7ms	291.0ms	-6.9%	291.0ms	4.3ms	10
web	`route:client-entry`	1291	212.4ms	205.4ms	-3.3%	205.4ms	5.0ms	11
node	`module:client-only-stub`	5	111.9ms	59.6ms	-46.7%	59.6ms	18.7ms	5
node	`manifest:transform`	5	76.3ms	82.8ms	+8.5%	82.8ms	20.2ms	5
web	`manifest:stage`	18	15.7ms	15.9ms	+1.3%	15.9ms	1.3ms	18
web	`manifest:transform`	5	0.5ms	0.5ms	0.0%	0.5ms	0.1ms	5

synthetic-256-ssr-esm Plugin Operations

Environment	Operation	Count	Base total	Head total	Delta	Head wall	Head max	Reports
web	`route:module`	1290	704.1ms	713.9ms	+1.4%	713.9ms	21.1ms	10
node	`route:module`	1290	273.9ms	266.5ms	-2.7%	266.5ms	4.0ms	10
web	`route:client-entry`	1290	201.8ms	195.9ms	-2.9%	195.9ms	4.8ms	10
node	`manifest:transform`	5	103.1ms	79.2ms	-23.2%	79.2ms	20.5ms	5
node	`module:client-only-stub`	5	70.1ms	38.4ms	-45.2%	38.4ms	13.2ms	5
web	`manifest:stage`	15	14.7ms	14.2ms	-3.4%	14.2ms	1.4ms	15
web	`manifest:transform`	5	0.5ms	0.5ms	0.0%	0.5ms	0.1ms	5

synthetic-256-ssr-esm-split Plugin Operations

Environment	Operation	Count	Base total	Head total	Delta	Head wall	Head max	Reports
web	`route:module`	1291	683.4ms	721.9ms	+5.6%	721.9ms	23.7ms	11
node	`route:module`	1290	276.9ms	281.9ms	+1.8%	281.9ms	4.4ms	10
web	`route:client-entry`	1291	206.6ms	194.6ms	-5.8%	194.6ms	4.8ms	11
node	`module:client-only-stub`	5	97.0ms	103.5ms	+6.7%	103.5ms	49.3ms	5
node	`manifest:transform`	5	84.0ms	73.1ms	-13.0%	73.1ms	15.2ms	5
web	`manifest:stage`	16	14.8ms	14.7ms	-0.7%	14.7ms	1.4ms	16
web	`manifest:transform`	5	0.5ms	0.5ms	0.0%	0.5ms	0.1ms	5

synthetic-48-ssr-esm Plugin Operations

Environment	Operation	Count	Base total	Head total	Delta	Head wall	Head max	Reports
web	`route:module`	250	233.3ms	216.8ms	-7.1%	216.8ms	9.9ms	10
node	`route:module`	250	87.5ms	77.0ms	-12.0%	77.0ms	0.7ms	10
web	`route:client-entry`	250	57.5ms	60.6ms	+5.4%	60.6ms	3.6ms	10
node	`module:client-only-stub`	5	34.7ms	43.3ms	+24.8%	43.3ms	13.3ms	5
node	`manifest:transform`	5	22.3ms	28.4ms	+27.4%	28.4ms	6.3ms	5
web	`manifest:stage`	15	3.9ms	3.8ms	-2.6%	3.8ms	0.4ms	15
web	`manifest:transform`	5	0.5ms	0.5ms	0.0%	0.5ms	0.1ms	5

Synthetic Rsbuild App

Rendered 2 production build benchmarks.

Benchmark	Runs	Base total	Head total	Delta	Head mean	Head p95	Speedup	Head RSS p95	Head client JS gzip	Client JS gzip delta	Head total gzip
complex app	3	96.12s	115.86s	+20.5%	114.91s	-	0.83x	-	-	-	-
complex app	3	68.51s	72.00s	+5.1%	72.11s	-	0.95x	-	-	-	-

Rendered 1 dev benchmark fixture from the embedded complex app.

Benchmark	Runs	Base total	Head total	Delta	Base ready	Head ready	Base routes	Head routes	Base update/HMR	Head update/HMR	Update delta	Head mean	Head p95	Speedup	Head RSS p95
complex app	3	88.52s	85.66s	-3.2%	78.35s	75.83s	2.12s	2.16s	4.54s	3.73s	-18.0%	85.65s	-	1.03x	-

Profile: ci-small+ci-large; mode: dev; iterations: 5; warmup: 1.
The uploaded benchmark artifact includes diagnostics/summary.md and diagnostics/summary.json with runner metadata, per-run timing samples, CPU/RSS samples, and plugin timing hot spots.
Workflow run

Skip bundle stats on discarded warmup runs, gzip asynchronously off the event loop, reuse the read buffer's length instead of a second stat call, inline the single-consumer CI column and comparison-metric indirections, and drop the never-rendered totalGzipDeltaPercent field. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Avoid reporting zero bundle metrics when a successful measured build did not produce its expected output directory.

Optimize prod browser output

f776aad

ScriptedAlchemy force-pushed the codex/prod-rspack-output-main-20260708 branch from b937c0e to f776aad Compare July 8, 2026 17:59

ScriptedAlchemy and others added 5 commits July 9, 2026 23:36

Merge branch 'main' into codex/prod-rspack-output-main-20260708

a201fa1

Merge branch 'main' into codex/prod-rspack-output-main-20260708

ef7814c

fix: reject missing benchmark build output

b8da2df

Avoid reporting zero bundle metrics when a successful measured build did not produce its expected output directory.

Merge origin/main into codex/prod-rspack-output-main-20260708

0dcfc93

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Optimize prod browser output#85

Optimize prod browser output#85
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ScriptedAlchemy commented Jul 8, 2026

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ScriptedAlchemy commented Jul 8, 2026

Summary

Validation

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Benchmark Results

Reading benchmark confidence

Dev Rollup

Production Build Benchmarks

ci-small+ci-large Dev Fixture Summary

large-355-ssr-esm Plugin Operations

synthetic-1024-ssr-esm Plugin Operations

synthetic-1024-ssr-esm-split Plugin Operations

synthetic-256-sourcemaps Plugin Operations

synthetic-256-ssr-esm Plugin Operations

synthetic-256-ssr-esm-split Plugin Operations

synthetic-48-ssr-esm Plugin Operations

Synthetic Rsbuild App

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pkg-pr-new Bot commented Jul 8, 2026 •

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