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Interactivity API: Break up long hydration task in interactivity init #58227

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merged 3 commits into from
Jan 26, 2024

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@westonruter westonruter commented Jan 25, 2024

Fixes #58225.

What?

Avoid long task during interactivity initialization

Why?

Long tasks create a poor user experience and can negatively impact Largest Contentful Paint (LCP), Total Blocking Time (TBT), First Input Delay (FID), and Interaction to Next Paint (INP).

How?

As outlined in Optimize Long Tasks, this breaks up the long task in the init() by yielding to main after each node is hydrated.

Testing Instructions

  1. Add 20 blocks using interactivity to a post.
  2. Run profiling in DevTools with and without 6x CPU slowdown.
  3. Check for improvements to whether initialization causes a long task.

Screenshots or screencast

Without CPU Throttling

Before After
image image

With 6x CPU Throttling

Before After
image image

Lighthouse Performance Audit

Before After
image image

@westonruter westonruter added [Type] Performance Related to performance efforts [Feature] Interactivity API API to add frontend interactivity to blocks. [Packages] Interactivity /packages/interactivity labels Jan 25, 2024
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github-actions bot commented Jan 25, 2024

Size Change: +208 B (0%)

Total Size: 1.7 MB

Filename Size Change
build/block-editor/index.min.js 250 kB +8 B (0%)
build/block-editor/style-rtl.css 15.4 kB +7 B (0%)
build/block-editor/style.css 15.3 kB +7 B (0%)
build/block-library/blocks/embed/editor-rtl.css 322 B +29 B (+10%) ⚠️
build/block-library/blocks/embed/editor.css 322 B +29 B (+10%) ⚠️
build/block-library/editor-rtl.css 12.3 kB +11 B (0%)
build/block-library/editor.css 12.3 kB +10 B (0%)
build/block-library/index.min.js 215 kB -16 B (0%)
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build/components/style-rtl.css 12 kB -30 B (0%)
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build/edit-site/style.css 15.2 kB -47 B (0%)
build/interactivity/index.min.js 12.9 kB +38 B (0%)
ℹ️ View Unchanged
Filename Size
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github-actions bot commented Jan 25, 2024

Flaky tests detected in 645c945.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/7648182936
📝 Reported issues:

@westonruter westonruter changed the title Interactivity API: Break long hydration task in interactivity init Interactivity API: Break up long hydration task in interactivity init Jan 25, 2024
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This is fantastic 👏 👏

I didn't know breaking down tasks like this was so simple.


Could you please add an entry in the package Changelog?

packages/interactivity/src/init.js Outdated Show resolved Hide resolved
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westonruter commented Jan 25, 2024

Could you please add an entry in the package Changelog?

Done in cffdb4d!

Comment on lines +38 to +42
if ( ! hydratedIslands.has( node ) ) {
await yieldToMain();
const fragment = getRegionRootFragment( node );
const vdom = toVdom( node );
await yieldToMain();
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@westonruter westonruter Jan 25, 2024

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@luisherranz Actually, what is the purpose of hydratedIslands here? Could it be that the check for ! hydratedIslands.has( node ) could be done so that the condition is entered, but then yielding occurs so that it's possible that the island could be hydrated by another task? Could it be that toVdom() accidentally gets called on a hydrated island?

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@luisherranz luisherranz Jan 26, 2024

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what is the purpose of hydratedIslands here?

Islands that are inside other islands belong to the same Preact application so they can share context and such. When an island is already hydrated as part of a parent, we skip its own hydration.

that it's possible that the island could be hydrated by another task?

I actually spotted a bug yesterday due to the fact that the router store was calling toVdom before the init. It's a rare edge case, but I'll fix it.

As toVdom is going to be a private, core-only API in WP 6.5, there should no be more problems. But in the future, if toVdom is exposed publicly, we can add a second argument to toVdom( node, isHydrating = false ) to know if it should add the nodes to the hydratedIslands map or not.

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I think this is an easy win and I wouldn't mind including it for WP 6.5.

Feel free to merge.

@westonruter westonruter merged commit 8131c43 into trunk Jan 26, 2024
56 checks passed
@westonruter westonruter deleted the fix/interactivity-hydration-long-task branch January 26, 2024 17:08
@github-actions github-actions bot added this to the Gutenberg 17.7 milestone Jan 26, 2024
westonruter added a commit that referenced this pull request Jan 26, 2024
…zy-hydration

* origin/trunk: (47 commits)
  Interactivity API: Break up long hydration task in interactivity init (#58227)
  Add supports.interactivity to Query block (#58316)
  Font Library: Make notices more consistent (#58180)
  Fix Global styles text settings bleeding into placeholder component (#58303)
  Fix the position and size of the Options menu, (#57515)
  DataViews: Fix safari grid row height issue (#58302)
  Try a fix (#58282)
  Navigation Submenu Block: Make block name affect list view (#58296)
  Apply custom scroll style to fixed header block toolbar (#57444)
  Add support for transform and letter spacing controls in Global Styles > Typography > Elements (#58142)
  DataViews: Fix table view cell wrapper and BlockPreviews (#58062)
  Workflows: Add 'Technical Prototype' to the type-related labels list (#58163)
  Block Editor: Optimize the 'useBlockDisplayTitle' hook (#58250)
  Remove noahtallen from .wp-env codeowners (#58283)
  Global styles revisions: fix is-selected rules from affecting other areas of the editor (#58228)
  Try: Disable text selection for post content placeholder block. (#58169)
  Remove `template-only` mode from editor and edit-post packages (#57700)
  Refactored download/upload logic to support font faces with multiple src assets (#58216)
  Components: Expand theming support in COLORS (#58097)
  Implementing new UX for invoking rich text Link UI  (#57986)
  ...
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[Feature] Interactivity API API to add frontend interactivity to blocks. [Packages] Interactivity /packages/interactivity [Type] Performance Related to performance efforts
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Interactivity API: Hydration causes long task
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