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StartPageOptions: load and parse patterns only after establishing the need for them #53673

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merged 2 commits into from
Aug 23, 2023

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@jsnajdr jsnajdr commented Aug 15, 2023

This PR fixes an issue where block patterns are parsed during the editor initial load, synchronously, and therefore are slowing down the load. I discovered the issue when working on async block loading in #51778.

The problem is with the <StartPageOptions> component (added in #40034) which displays a modal to select a pattern when creating a brand new page from scratch. This component looks at the list of patterns, which triggers pattern parsing. But most of the time the component will not be displayed at all, because there are preconditions that are rarely satisfied: the page content is empty and unsaved. And yet patterns get synchronously parsed during the initial load.

This PR fixes the issue by refactoring StartPageOptions into two nested components. The outer one checks the preconditions (freshly created page) and renders the inner component, the one that parses patterns, only when the precondition is satisfied.

The second commit removes the usePreParsePatterns hook (added in #29444) completely. Even though this hook parses patterns only during idle time, I believe we don't need it. It's OK to wait until patterns are actually needed, e.g., when opening the block inserter.

How to test:
Verify that before this PR patterns were parsed on initial load, while after this PR they are parsed only when opening the block inserter. Can be done by adding a logpoint to the __experimentalGetParsedPattern selector.

Then verify that StartPageOptions is correctly shown. It's shown after creating a new page, and when you have a pattern with blockTypes = [ 'core/post-content' ]. You can temporarily change the condition from core/post-content to core/query to see matching patterns in themes like Twenty Twenty Three.

@jsnajdr jsnajdr added [Type] Performance Related to performance efforts [Package] Block editor /packages/block-editor labels Aug 15, 2023
@jsnajdr jsnajdr requested a review from ellatrix as a code owner August 15, 2023 10:27
@jsnajdr jsnajdr self-assigned this Aug 15, 2023
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Size Change: -284 B (0%)

Total Size: 1.51 MB

Filename Size Change
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build/edit-post/index.min.js 35.7 kB -50 B (0%)
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},
[ modalState, hasStartPattern ]
);
function StartPageOptionsModal() {
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I believe there's also StartTemplateOptions in the site editor, I wonder if it suffers the same issue.

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That's a good point, I reviewed StartTemplateOptions, and found that it also parses patterns, but it already uses the "two nested components" technique that my PR introduces for StartPageOptions. The outer component checks the pre-conditions, and only the inner component starts working with patterns.

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Flaky tests detected in 963558d.
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/5866135079
📝 Reported issues:

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This cleanup looks good to me and tests well 👍

I also found that it's slightly improving some core vitals metrics by 5-6%, for example:

This branch:

  • FP: 2.01s
  • DCL: 2.20s
  • FCP: 2.64s
  • LCP: 3.17s

trunk

  • FP: 1.97s
  • DCL: 2.31s
  • FCP: 2.81s
  • LCP: 3.38s

Given that it surely doesn't make things worse (and even appears to be improving them) I think we should land it and keep an eye on the averaged code vitals metrics 🚀

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[Package] Block editor /packages/block-editor [Type] Performance Related to performance efforts
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