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Improve the getBlock and getBlocks performance #34241

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@youknowriad youknowriad commented Aug 23, 2021

The getBlock and getBlocks selector in the block-editor state represent one of our bottlenecks in terms of typing performance. It's important that they are as fast as possible.

In trunk we rely on a cacheKey stored in the reducer to indicate whether the block object need to be recomputed or not. I believe we can do a bit better and make everything simpler by denormalizing the block objects and computing them directly in the reducer. This means we can remove the memoization from these selectors and just return the cached values.

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Size Change: +221 B (0%)

Total Size: 1.04 MB

Filename Size Change
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build/editor/index.min.js 37.6 kB -27 B (0%)
ℹ️ View Unchanged
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@youknowriad
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@youknowriad youknowriad commented Aug 24, 2021

@Copons Hi there! in this PR I'm doing a performance related refactoring and I'm seeing a failure in the template-revert e2e test. I've tried debugging but it seems to be passing sometimes and failing at other times. I also tried manually and it seems to work. So I was wondering if you might help here cause I'm a bit unfamiliar with this.

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@Copons Copons commented Aug 24, 2021

@Copons Hi there! in this PR I'm doing a performance related refactoring and I'm seeing a failure in the template-revert e2e test. I've tried debugging but it seems to be passing sometimes and failing at other times. I also tried manually and it seems to work. So I was wondering if you might help here cause I'm a bit unfamiliar with this.

I'm not quite sure.
The original PR is kinda old and was more of a team effort... (in other words, I forgot all about it 😄).

The test works for me as well locally, and even performing the same test actions manually results in the expected, correct, behaviour.
I'd really love to strike this off as a false negative, especially because it only happens intermittently, but the reported error is indeed consistent with the spec. 🤔

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@youknowriad youknowriad commented Aug 24, 2021

@Copons Thanks for chiming in, I think I found a fix in the latest commit.

@youknowriad youknowriad force-pushed the refactor/get-block-selector branch from 234dda4 to d668acf Aug 24, 2021
@youknowriad youknowriad marked this pull request as ready for review Aug 24, 2021
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