Add ExpansionTile.builder ? ExpansionTile Performance Issue #40752

Activity

1. ghost added

   c: performanceRelates to speed or footprint issues (see "perf:" labels)Relates to speed or footprint issues (see "perf:" labels)

   on Sep 18, 2019
2. HansMuller

   added

   p: material_uimaterial_ui package in flutter/packagesmaterial_ui package in flutter/packages

   frameworkflutter/packages/flutter repository. See also f: labels.flutter/packages/flutter repository. See also f: labels.

   c: new featureNothing broken; request for a new capabilityNothing broken; request for a new capability

   on Sep 18, 2019
3. deisold commented on Dec 10, 2019

   

   deisold

   on Dec 10, 2019

   More actions

   on Flutter Web (Channel master, v1.13.1-pre.76) it stucks completely and the listview stops scrolling while cpu gets up to 100%.

   Would be nice to have this fixed.
4. liyuqian

   added

   platform-webWeb applications specificallyWeb applications specifically

   on Oct 12, 2020
5. liyuqian commented on Oct 12, 2020

   

   liyuqian

   on Oct 12, 2020

   Contributor

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   Adding web label as the performance seems to be particularly bad on web. This doesn't seem to be a very complicated change so I'm adding it to "Framework Performance Opportunities" project.
6. yjbanov commented on Oct 15, 2020

   

   yjbanov

   on Oct 15, 2020

   Contributor

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   We made some improvements in Q2 in scrollable content with lots of children. Is there a repro case we could look at?
7. yjbanov

   added

   waiting for responseThe Flutter team cannot make further progress on this issue until the original reporter respondsThe Flutter team cannot make further progress on this issue until the original reporter responds

   on Oct 15, 2020
8. jmagman commented on Nov 5, 2020

   

   jmagman

   on Nov 5, 2020

   Member

   More actions

   Without additional information, we are unfortunately not sure how to resolve this issue. We are therefore reluctantly going to close this bug for now. Please don't hesitate to comment on the bug if you have any more information for us; we will reopen it right away!

   Thanks for your contribution.

   👎React with 👎1Reacted by moneer-muntazah
9. jmagman

   closed this as completedon Nov 5, 2020
10. pedromassangocode

    removed

    waiting for responseThe Flutter team cannot make further progress on this issue until the original reporter respondsThe Flutter team cannot make further progress on this issue until the original reporter responds

    on Nov 20, 2020
11. MatrixDev commented on Apr 8, 2021

    

    MatrixDev

    on Apr 8, 2021

    More actions

    I have the same issue. Which exact information do you need?
    Just create ListView with ExpansionTile which contains 1000+ heavy items and fps will stuck.
    Problem is that ExpansionTile, unlike ListView, is not lazy and loads all the items at once. It must load only visible items to have optimal performance.

        final Widget result = Offstage(
          child: TickerMode(
            child: Padding(
              padding: widget.childrenPadding ?? EdgeInsets.zero,
              child: Column(
                crossAxisAlignment: widget.expandedCrossAxisAlignment ?? CrossAxisAlignment.center,
                children: widget.children, // <<< this is what causes performance problems
              ),
            ),
            enabled: !closed,
          ),
          offstage: closed
        );

    In my case I have 3 ExpansionTile collapsed by default with 100+ items in each. First time displaying my screen takes a huge performance hit, same as each collapse/expand.

    IMHO to properly fix this issue ExpansionTile must cooperate with ListView very tightly to display only visible children.

    👍React with 👍2Reacted by moneer-muntazah and Daniel Makepeace-Lane
12. github-actions commented on Aug 3, 2021

    

    github-actionsBot

    on Aug 3, 2021

    More actions

    This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.
13. github-actions

    locked as resolved and limited conversation to collaborators on Aug 3, 2021