chore: upgrade React experimental to 0.0.0-experimental-43bcbf80-20260603

[react-server-bot]

Automated daily upgrade of React packages to the latest experimental version.

Previous version: 0.0.0-experimental-561ed529-20260423
New version: 0.0.0-experimental-43bcbf80-20260603

Updated locations

• packages/react-server/package.json — react, react-dom, react-is
• package.json — all pnpm.overrides for React
• docs/ — micro-frontends MDX (en + ja) esm.sh URLs
• pnpm-lock.yaml

Smoke test

• Dev mode — hello world test passed ✅
• Build+start mode — hello world test passed ✅

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	react-server-docs	8b75f40	Jun 07 2026, 07:27 AM

[github-actions]

⚡ Flight Protocol Benchmark

Commit: d2199e9

Serialization (renderToReadableStream)

Scenario	@lazarv/rsc	webpack	vs webpack
react: minimal element	251.1K	59.3K	🟢 +323.7%
react: shallow wide (1000)	2.8K	445	🟢 +523.2%
react: deep nested (100)	29.0K	8.1K	🟢 +258.7%
react: product list (50)	8.5K	2.6K	🟢 +229.0%
react: large table (500x10)	430	132	🟢 +225.3%
data: primitives	203.6K	66.5K	🟢 +206.1%
data: large string (100KB)	29.2K	23.2K	🟢 +25.9%
data: nested objects (20)	72.0K	40.9K	🟢 +76.4%
data: large array (10K)	163	140	🟢 +16.0%
data: Map & Set	13.5K	7.3K	🟢 +84.3%
data: Date/BigInt/Symbol	174.2K	60.5K	🟢 +187.8%
data: typed arrays	54.9K	18.7K	🟢 +193.5%
data: mixed payload	8.9K	4.9K	🟢 +78.9%

Prerender (prerender)

Scenario	@lazarv/rsc ops/s	mean
react: minimal element	268.3K	3.8 µs
react: shallow wide (1000)	2.4K	412.1 µs
react: deep nested (100)	25.6K	39.7 µs
react: product list (50)	7.9K	128.0 µs
react: large table (500x10)	389	2.58 ms
data: primitives	220.4K	4.7 µs
data: large string (100KB)	1.1K	944.6 µs
data: nested objects (20)	72.1K	14.2 µs
data: large array (10K)	160	6.25 ms
data: Map & Set	13.5K	74.9 µs
data: Date/BigInt/Symbol	185.2K	5.5 µs
data: typed arrays	865	1.16 ms
data: mixed payload	8.2K	123.5 µs

Deserialization (createFromReadableStream)

Scenario	@lazarv/rsc	webpack	vs webpack
react: minimal element	189.3K	137.6K	🟢 +37.6%
react: shallow wide (1000)	31.3K	2.3K	🟢 +1238.7%
react: deep nested (100)	126.7K	22.8K	🟢 +455.4%
react: product list (50)	62.5K	16.8K	🟢 +272.7%
react: large table (500x10)	3.8K	2.5K	🟢 +52.0%
data: primitives	154.2K	124.0K	🟢 +24.3%
data: large string (100KB)	46.2K	43.2K	🟢 +7.0%
data: nested objects (20)	98.1K	71.9K	🟢 +36.4%
data: large array (10K)	346	288	🟢 +20.2%
data: Map & Set	19.3K	16.9K	🟢 +14.6%
data: Date/BigInt/Symbol	154.1K	112.8K	🟢 +36.6%
data: typed arrays	61.8K	53.4K	🟢 +15.8%
data: mixed payload	26.8K	16.5K	🟢 +62.5%

Roundtrip (serialize + deserialize)

Scenario	@lazarv/rsc	webpack	vs webpack
react: minimal element	144.3K	44.2K	🟢 +226.8%
react: shallow wide (1000)	2.5K	376	🟢 +574.4%
react: deep nested (100)	25.2K	5.8K	🟢 +331.9%
react: product list (50)	7.6K	2.3K	🟢 +235.6%
react: large table (500x10)	381	125	🟢 +205.5%
data: primitives	108.9K	46.1K	🟢 +136.4%
data: large string (100KB)	19.2K	18.6K	🟢 +2.9%
data: nested objects (20)	46.2K	26.9K	🟢 +71.4%
data: large array (10K)	109	90	🟢 +22.1%
data: Map & Set	7.8K	5.1K	🟢 +54.3%
data: Date/BigInt/Symbol	101.2K	38.1K	🟢 +165.7%
data: typed arrays	42.2K	15.9K	🟢 +164.7%
data: mixed payload	6.5K	3.6K	🟢 +79.4%

Legend & methodology

Indicators: 🟢 > 1% faster | 🔴 > 1% slower | ⚪ within noise margin

vs webpack: compares @lazarv/rsc against react-server-dom-webpack within the same run.
vs baseline: compares @lazarv/rsc against the previous main branch run.

Values shown are operations/second (higher is better). Each scenario runs for at least 100 iterations with warmup.

Benchmarks run on GitHub Actions runners (shared infrastructure) — expect ~5% variance between runs. Consistent directional changes across multiple scenarios are more meaningful than any single number.

[github-actions]

⚡ Benchmark Results

	PR 8b75f40	main ea77130
Config	50 connections, 10s/test	50 connections, 10s/test

Benchmark	Req/s	vs main	Avg Latency	vs main	P99 Latency	Throughput
minimal	1301	🔴 -14.8%	37.79 ms	🔴 +17.7%	74 ms	0.8 MB/s
small	1285	🔴 -15.7%	38.22 ms	🔴 +18.7%	68 ms	1.3 MB/s
medium	367	🔴 -10.5%	134.05 ms	🔴 +11.6%	200 ms	5.4 MB/s
large	44	🔴 -1.6%	1052.69 ms	🔴 +4.9%	1969 ms	4.5 MB/s
deep	886	🔴 -11.8%	55.7 ms	🔴 +13.7%	89 ms	3.0 MB/s
wide	74	🟢 +2.5%	666.98 ms	🟢 -1.7%	1151 ms	4.0 MB/s
cached	3488	🔴 -3.2%	13.76 ms	🔴 +3.5%	28 ms	51.2 MB/s
client-min	456	🔴 -19.9%	108.26 ms	🔴 +24.9%	170 ms	1.9 MB/s
client-small	461	🔴 -22.0%	107.45 ms	🔴 +28.6%	154 ms	2.1 MB/s
client-med	337	🔴 -17.9%	145.47 ms	🔴 +20.7%	202 ms	6.2 MB/s
client-large	79	🔴 -4.3%	608.62 ms	🔴 +3.7%	1038 ms	8.3 MB/s
client-deep	431	🔴 -17.3%	114.83 ms	🔴 +20.9%	168 ms	3.0 MB/s
client-wide	131	🔴 -6.2%	376.81 ms	🔴 +7.4%	689 ms	7.6 MB/s
rsc-client-large	1093	🔴 -15.8%	45.01 ms	🔴 +18.9%	66 ms	2.8 MB/s
rsc-client-wide	1120	🔴 -13.1%	43.98 ms	🔴 +15.3%	70 ms	2.9 MB/s
static-json	7517	🔴 -31.9%	6.11 ms	🔴 +59.1%	14 ms	3.1 MB/s
static-js	7042	🔴 -34.4%	6.51 ms	🔴 +61.1%	15 ms	8.9 MB/s
404-miss	4884	🔴 -14.0%	9.71 ms	🔴 +19.3%	20 ms	0.6 MB/s
hybrid-min	445	🔴 -22.2%	111.36 ms	🔴 +28.6%	172 ms	2.1 MB/s
hybrid-small	432	🔴 -19.2%	114.21 ms	🔴 +23.6%	163 ms	2.5 MB/s
hybrid-medium	217	🔴 -18.1%	225.43 ms	🔴 +20.6%	324 ms	9.2 MB/s
hybrid-large	36	🔴 -16.6%	1286.25 ms	🔴 +20.1%	2873 ms	11.7 MB/s
hybrid-deep	357	🔴 -15.4%	138.95 ms	🔴 +19.2%	203 ms	4.9 MB/s
hybrid-wide	61	🔴 -3.0%	776.63 ms	🔴 +3.5%	1286 ms	12.0 MB/s
hybrid-cached	3084	🔴 -2.9%	15.65 ms	🔴 +3.0%	30 ms	131.1 MB/s
hybrid-client-min	484	🔴 -16.9%	102.34 ms	🔴 +21.0%	148 ms	2.1 MB/s
hybrid-client-small	473	🔴 -18.0%	104.24 ms	🔴 +22.0%	157 ms	2.2 MB/s
hybrid-client-medium	346	🔴 -13.9%	142.98 ms	🔴 +16.4%	213 ms	6.4 MB/s
hybrid-client-large	76	🔴 -8.9%	621.49 ms	🔴 +8.6%	1280 ms	8.0 MB/s
hybrid-client-deep	433	🔴 -17.7%	114.22 ms	🔴 +21.3%	171 ms	3.1 MB/s
hybrid-client-wide	132	🔴 -6.3%	372.43 ms	🔴 +8.5%	699 ms	7.7 MB/s

Legend

🟢 > 1% improvement | 🔴 > 1% regression | ⚪ within noise margin

Benchmarks run on GitHub Actions runners (shared infrastructure) — expect ~5% variance between runs. Consistent directional changes across multiple routes are more meaningful than any single number.

[codecov-commenter]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
990	1	989	143

View the top 1 failed test(s) by shortest run time

__test__/bun.spec.mjs > create-react-server: bun runtime (npm)

Stack Traces | 2s run time

Error: Command failed: docker build -t create-react-server-test-bun -f .../test/docker/Dockerfile.bun .
 ❯ buildImage __test__/utils.mjs:194:11
 ❯ __test__/bun.spec.mjs:25:17

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
Serialized Error: { status: 1, signal: null, output: [ null, null, null ], pid: 2744, stdout: null, stderr: null }

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