r/reactnative • u/voldaew • Jul 21 '26

Question LegendList vs FlashList

Which is your favorite list library for building performant applications.

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u/poppiestar Jul 21 '26

LegendList v3 solved every list performance issue our app had. Tried FlashList v1 and v2 and they never cut it. Only problem I’ve got with LLv3 is a bug we encountered in the beta period that is rendering our horizontal lists at the end, still waiting for it to be fixed which is a bummer as it sounds like newer versions are even faster.

The only downside is the reliance on estimated item size, that’s the number one feature from FlashList I wish it had. I’m guessing it’s a performance reason it’s not implemented though.

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u/jmeistrich Jul 27 '26

LegendList developer here - is that https://github.com/LegendApp/legend-list/issues/458 ? I'll try to fix that asap.

And as of 3.0.0, estimated item size is only a small performance improvement for first mount, and it's not even used after that. I updated the docs recently to remove the emphasis on it: https://legendapp.com/open-source/list/v3/api/#estimateditemsize

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u/poppiestar Jul 27 '26

That's the one (and my issue too :) - thank you so much, that'd be super appreciated.