Wild lags when animation `extraContentPadding` on large lists (especially android)

[dikiyp]

Describe the bug

I used extraContentPadding when changing the height of the input field (specifically when replying to a message), and everything works more or less smoothly on short lists, but as soon as the list has 16 or more messages, everything starts to lag (especially when the keyboard is open). I'm using FlashList. And and Android just chokes on the lag

Code snippet

const renderScrollComponent = useCallback(
    (props: KeyboardChatScrollViewProps) => (
      <KeyboardChatScrollView
        {...props}
        contentInsetAdjustmentBehavior="never"
        keyboardDismissMode="on-drag"
        offset={base.spacing.lg}
        extraContentPadding={footerHeight}
        automaticallyAdjustContentInsets={false}
        keyboardLiftBehavior="always"
      />
    ),
    [],
  )

Repo for reproducing

https://github.com/slipe-fun/Bloom-mobile

To Reproduce

1.Create a chat
2.Spam around 15-20 messages
3. Try to reply when keyboard opened/closed
4.

Expected behavior

Just no lags 😭😭

Screenshots

I can't upload to github, so i uploaded on gDrive: https://drive.google.com/file/d/1SIpLvnqsvRqWoAfZFwK9A8RaOzw7ovja/view?usp=sharing

Smartphone (please complete the following information):

• Desktop OS: macOS Sonoma 14.8.1
• Device: iphone 12 mini
• OS: iOS 26.4
• RN version: 0.81.5
• RN architecture: newest
• JS engine: Hermes
• Library version: 1.21.0

[kirillzyusko]

Hey @dikiyp

Did you try to enable reanimated feature flags? If yes, then which one?..

[dikiyp]

Hey @dikiyp

Did you try to enable reanimated feature flags? If yes, then which one?..

Nope, which one should i enable?

[kirillzyusko]

@dikiyp I would try to enable all feature flags listed in https://docs.swmansion.com/react-native-reanimated/docs/guides/feature-flags/

If none of them help then I will be happy to continue investigation on my end 😊

[dikiyp]

@kirillzyusko sorry for late answer. i tried every experimental flag, but they all doesnt help me at all, so i hope u help me to find out issue :)

[pip64]

hey?