[Due for payment 2026-04-28] [$1000] Migrate the main chat list to FlashList

@mallenexpensify

HOLD on:

Comment linking to be 100% complete
The new architecture to be enabled (this is not a hard requirement but I have a hunch that this should wait on that too)

Problem

The main chat list is one of the most, if not the most important component in our app. If you scroll far or fast on this list, you may see frames drop. Furthermore, there are some known performance issues with this list (example). We have already migrated almost every other virtualized list in our app from FlatList to FlashList, because its performance is much better.

Solution

Let's build support for bidirectional pagination in FlashList, then enable it on the main chat list in E/App.

Issue Owner

Current Issue Owner: @mallenexpensify

@garrettmknight

Triggered auto assignment to @garrettmknight (NewFeature), see https://stackoverflowteams.com/c/expensify/questions/14418#:~:text=BugZero%20process%20steps%20for%20feature%20requests for more details.

I expect this to be on HOLD until sometime in February, if not later, so I'm moving this back to monthly

@muttmuure

cc @muttmuure adding this to the New Expensify performance improvements project. I acknowledge that the problem statement is a bit of a reverse-solution but I think it's a good bet that this will provide substantial performance improvements, as FlashList is just much better for performance than FlatList. We've established that elsewhere where we've migrated to FlashList

Still on HOLD

@VickyStash

Payment Summary

Upwork Job

Contributor: @VickyStash does not require payment (Contractor)
Reviewer: @shubham1206agra owed $1000 via NewDot
Reviewer: @situchan owed $1000 via NewDot

BugZero Checklist (@mallenexpensify)

(if NewFeature) I have created a PR for any necessary HelpDot updates, or I confirmed no updates are necessary.
I have verified the correct assignees and roles are listed above and updated the necessary manual offers
I have verified that there are no duplicate or incorrect contracts on Upwork for this job (https://www.upwork.com/ab/applicants//hired)
I have verified the PR was not reverted
I have applied any discounts due to bugs/regressions introduced by this PR
I have paid out the Upwork contracts or cancelled the ones that are incorrect
I have verified the payment summary above is correct

@mallenexpensify

Waiting for @mallenexpensify

@shubham1206agra

Payment Summary

Contributor+: @shubham1206agra due $1000 via NewDot
Contributor+: @situchan due $500 via NewDot.

@mountiny what's @situchan due? they didn't review the same PRs as @shubham1206agra (and there's 300+ comments on this issue). Thx

I also reviewed 2 complex PRs:

Follow-ups:
#85443
#88066
#88179
#88321
#88529

@shubham1206agra

$1,000 approved for @shubham1206agra

@mallenexpensify

@mallenexpensify Eep! 4 days overdue now. Issues have feelings too...

@situchan

$500 to @situchan as well @mallenexpensify

@mountiny

Thanks @mountiny . @situchan paid, summary updated above.

@situchan

$500 approved for @situchan

As a follow up I've started to turn patches we have created into FlashList PRs:
Shopify/flash-list#2096
Shopify/flash-list#2300
I'm going to raise small PR to reference correct links instead of just TBD:
ex:

App/patches/@shopify/flash-list/details.md

Line 9 in 64fe168

- Upstream PR/issue: TBD

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[Due for payment 2026-04-28] [$1000] Migrate the main chat list to FlashList #33725

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[Due for payment 2026-04-28] [$1000] Migrate the main chat list to FlashList #33725

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melvin-bot commented on Dec 28, 2023

roryabraham commented on Dec 28, 2023

roryabraham commented on Dec 28, 2023

roryabraham commented on Jan 17, 2024

300 remaining items

melvin-bot commented on Apr 28, 2026

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BugZero Checklist (@mallenexpensify)

shubham1206agra commented on Apr 29, 2026

mallenexpensify commented on Apr 29, 2026

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situchan commented on Apr 29, 2026

JmillsExpensify commented on May 1, 2026

melvin-bot commented on May 4, 2026

mountiny commented on May 5, 2026

mallenexpensify commented on May 5, 2026

laurenreidexpensify commented on May 11, 2026

VickyStash commented on May 28, 2026

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