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Implement streamed hydration rfc#5035

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JoviDeCroock wants to merge 2 commits intomainfrom
streamed-hydration
Open

Implement streamed hydration rfc#5035
JoviDeCroock wants to merge 2 commits intomainfrom
streamed-hydration

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@JoviDeCroock JoviDeCroock commented Feb 23, 2026

Resolves #5034

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github-actions bot commented Feb 23, 2026 •
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📊 Tachometer Benchmark Results

Summary

duration

  • create10k: unsure 🔍 -0% - +0% (-3.25ms - +3.57ms)
    preact-local vs preact-main
  • filter-list: unsure 🔍 +0% - +0% (+0.01ms - +0.08ms)
    preact-local vs preact-main
  • hydrate1k: faster ✔ 1% - 4% (0.72ms - 2.52ms)
    preact-local vs preact-main
  • many-updates: unsure 🔍 -2% - +1% (-0.33ms - +0.11ms)
    preact-local vs preact-main
  • replace1k: unsure 🔍 -2% - +1% (-1.29ms - +0.41ms)
    preact-local vs preact-main
  • text-update: unsure 🔍 -2% - +5% (-0.04ms - +0.09ms)
    preact-local vs preact-main
  • todo: unsure 🔍 -2% - +1% (-0.49ms - +0.44ms)
    preact-local vs preact-main
  • update10th1k: unsure 🔍 -2% - +5% (-0.62ms - +1.38ms)
    preact-local vs preact-main

usedJSHeapSize

  • create10k: unsure 🔍 +0% - +0% (+0.00ms - +0.00ms)
    preact-local vs preact-main
  • filter-list: unsure 🔍 -0% - +0% (-0.00ms - +0.00ms)
    preact-local vs preact-main
  • hydrate1k: unsure 🔍 -11% - +2% (-0.79ms - +0.12ms)
    preact-local vs preact-main
  • many-updates: unsure 🔍 -0% - +0% (-0.01ms - +0.01ms)
    preact-local vs preact-main
  • replace1k: unsure 🔍 -0% - +0% (-0.00ms - +0.00ms)
    preact-local vs preact-main
  • text-update: unsure 🔍 -2% - +3% (-0.02ms - +0.03ms)
    preact-local vs preact-main
  • todo: unsure 🔍 +0% - +0% (+0.00ms - +0.00ms)
    preact-local vs preact-main
  • update10th1k: unsure 🔍 -0% - +0% (-0.00ms - +0.01ms)
    preact-local vs preact-main

Results

create10k

duration

VersionAvg timevs preact-localvs preact-main
preact-local869.40ms - 874.88ms-unsure 🔍
-0% - +0%
-3.25ms - +3.57ms
preact-main869.95ms - 874.00msunsure 🔍
-0% - +0%
-3.57ms - +3.25ms		-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local19.04ms - 19.04ms-unsure 🔍
+0% - +0%
+0.00ms - +0.00ms
preact-main19.04ms - 19.04msunsure 🔍
-0% - -0%
-0.00ms - -0.00ms		-
filter-list

duration

VersionAvg timevs preact-localvs preact-main
preact-local16.50ms - 16.55ms-unsure 🔍
+0% - +0%
+0.01ms - +0.08ms
preact-main16.45ms - 16.51msunsure 🔍
-0% - -0%
-0.08ms - -0.01ms		-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local1.54ms - 1.54ms-unsure 🔍
-0% - +0%
-0.00ms - +0.00ms
preact-main1.54ms - 1.54msunsure 🔍
-0% - +0%
-0.00ms - +0.00ms		-
hydrate1k

duration

VersionAvg timevs preact-localvs preact-main
preact-local59.46ms - 60.81ms-faster ✔
1% - 4%
0.72ms - 2.52ms
preact-main61.16ms - 62.35msslower ❌
1% - 4%
0.72ms - 2.52ms		-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local6.26ms - 6.92ms-unsure 🔍
-11% - +2%
-0.79ms - +0.12ms
preact-main6.61ms - 7.24msunsure 🔍
-2% - +12%
-0.12ms - +0.79ms		-
many-updates

duration

VersionAvg timevs preact-localvs preact-main
preact-local16.33ms - 16.57ms-unsure 🔍
-2% - +1%
-0.33ms - +0.11ms
preact-main16.38ms - 16.75msunsure 🔍
-1% - +2%
-0.11ms - +0.33ms		-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local3.72ms - 3.73ms-unsure 🔍
-0% - +0%
-0.01ms - +0.01ms
preact-main3.72ms - 3.73msunsure 🔍
-0% - +0%
-0.01ms - +0.01ms		-
replace1k
  • Browser: chrome-headless
  • Sample size: 100
  • Built by: CI #5404

  • Commit: 41e813e

duration

VersionAvg timevs preact-localvs preact-main
preact-local57.82ms - 59.05ms-unsure 🔍
-2% - +1%
-1.29ms - +0.41ms
preact-main58.28ms - 59.47msunsure 🔍
-1% - +2%
-0.41ms - +1.29ms		-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local2.99ms - 2.99ms-unsure 🔍
-0% - +0%
-0.00ms - +0.00ms
preact-main2.99ms - 2.99msunsure 🔍
-0% - +0%
-0.00ms - +0.00ms		-

run-warmup-0

VersionAvg timevs preact-localvs preact-main
preact-local25.40ms - 26.12ms-unsure 🔍
-1% - +3%
-0.35ms - +0.72ms
preact-main25.18ms - 25.97msunsure 🔍
-3% - +1%
-0.72ms - +0.35ms		-

run-warmup-1

VersionAvg timevs preact-localvs preact-main
preact-local32.16ms - 33.24ms-unsure 🔍
-2% - +2%
-0.76ms - +0.67ms
preact-main32.28ms - 33.22msunsure 🔍
-2% - +2%
-0.67ms - +0.76ms		-

run-warmup-2

VersionAvg timevs preact-localvs preact-main
preact-local33.07ms - 34.05ms-unsure 🔍
-2% - +1%
-0.79ms - +0.45ms
preact-main33.35ms - 34.11msunsure 🔍
-1% - +2%
-0.45ms - +0.79ms		-

run-warmup-3

VersionAvg timevs preact-localvs preact-main
preact-local26.40ms - 26.82ms-unsure 🔍
-0% - +2%
-0.04ms - +0.52ms
preact-main26.19ms - 26.56msunsure 🔍
-2% - +0%
-0.52ms - +0.04ms		-

run-warmup-4

VersionAvg timevs preact-localvs preact-main
preact-local25.22ms - 26.56ms-unsure 🔍
-3% - +4%
-0.81ms - +1.07ms
preact-main25.11ms - 26.42msunsure 🔍
-4% - +3%
-1.07ms - +0.81ms		-

run-final

VersionAvg timevs preact-localvs preact-main
preact-local21.53ms - 22.00ms-unsure 🔍
-3% - +0%
-0.70ms - +0.05ms
preact-main21.80ms - 22.39msunsure 🔍
-0% - +3%
-0.05ms - +0.70ms		-
text-update
  • Browser: chrome-headless
  • Sample size: 220
  • Built by: CI #5404

  • Commit: 41e813e

duration

VersionAvg timevs preact-localvs preact-main
preact-local1.89ms - 1.99ms-unsure 🔍
-2% - +5%
-0.04ms - +0.09ms
preact-main1.86ms - 1.96msunsure 🔍
-5% - +2%
-0.09ms - +0.04ms		-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local0.99ms - 1.03ms-unsure 🔍
-2% - +3%
-0.02ms - +0.03ms
preact-main0.99ms - 1.02msunsure 🔍
-3% - +2%
-0.03ms - +0.02ms		-
todo

duration

VersionAvg timevs preact-localvs preact-main
preact-local31.80ms - 32.37ms-unsure 🔍
-2% - +1%
-0.49ms - +0.44ms
preact-main31.74ms - 32.47msunsure 🔍
-1% - +2%
-0.44ms - +0.49ms		-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local1.25ms - 1.25ms-unsure 🔍
+0% - +0%
+0.00ms - +0.00ms
preact-main1.24ms - 1.25msunsure 🔍
-0% - -0%
-0.00ms - -0.00ms		-
update10th1k

duration

VersionAvg timevs preact-localvs preact-main
preact-local29.47ms - 31.01ms-unsure 🔍
-2% - +5%
-0.62ms - +1.38ms
preact-main29.23ms - 30.50msunsure 🔍
-5% - +2%
-1.38ms - +0.62ms		-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local2.95ms - 2.96ms-unsure 🔍
-0% - +0%
-0.00ms - +0.01ms
preact-main2.94ms - 2.95msunsure 🔍
-0% - +0%
-0.01ms - +0.00ms		-

tachometer-reporter-action v2 for CI

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github-actions bot commented Feb 23, 2026 •
edited
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Size Change: +212 B (+0.45%)

Total Size: 47.6 kB

Filename Size Change
dist/preact.js 4.73 kB +68 B (+1.46%)
dist/preact.mjs 4.75 kB +72 B (+1.54%)
dist/preact.umd.js 4.8 kB +72 B (+1.52%)
ℹ️ View Unchanged
Filename Size
compat/dist/compat.js 3.92 kB
compat/dist/compat.mjs 3.85 kB
compat/dist/compat.umd.js 3.98 kB
debug/dist/debug.js 3.91 kB
debug/dist/debug.mjs 3.91 kB
debug/dist/debug.umd.js 3.99 kB
devtools/dist/devtools.js 263 B
devtools/dist/devtools.mjs 273 B
devtools/dist/devtools.umd.js 348 B
hooks/dist/hooks.js 1.52 kB
hooks/dist/hooks.mjs 1.55 kB
hooks/dist/hooks.umd.js 1.59 kB
jsx-runtime/dist/jsxRuntime.js 892 B
jsx-runtime/dist/jsxRuntime.mjs 861 B
jsx-runtime/dist/jsxRuntime.umd.js 966 B
test-utils/dist/testUtils.js 473 B
test-utils/dist/testUtils.mjs 473 B
test-utils/dist/testUtils.umd.js 555 B

compressed-size-action

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coveralls commented Feb 23, 2026 •
edited
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Coverage Status

coverage: 99.537%. remained the same
when pulling 41e813e on streamed-hydration
into 4885f1d on main.

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RFC: Streaming SSR Hydration Coordination for Preact Core

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@JoviDeCroock @coveralls @marvinhagemeister