useBlockControlsFill: avoid unneeded store subscriptions#55340
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jsnajdr
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[Type] Performance
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Size Change: 0 B Total Size: 1.65 MB ℹ️ View Unchanged
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tyxla
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Oct 13, 2023
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Nice find 👍
It's a pretty straightforward change and I'm fairly confident it's safe.
While it doesn't bring amazing perf improvements, it's still a nice little one.
Thanks 🚀
tyxla
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Oct 17, 2023
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Something that came up while discussing these kinds of optimizations is that it could be worth adding a comment to describe what we're doing. Otherwise, it could be very easy to lose this optimization in a refactor.
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When a block renders a
<BlockControls>markup, its contents are rendered in the slot only if the block is selected. TheuseBlockControlsFillensures that, returning a non-null fill only when the block is selected.This PR optimizes the
useBlockControlsFillhook: ifshareWithChildBlocksis false, it can return early without creating any subscriptions to theblock-editorstore. And reducing number of subscriptions helps fix #54819.On a large post with 1000 blocks, I'm seeing (using the debug code from #55337) a reduction by 1500 subscriptions, from 77.5k to 76k.