1768728 - treeview performance is very poor compared to rest of UI

Status: RESOLVED DUPLICATE of bug 1724841

(Thunderbird :: Mail Window Front End, defect)

Description

[Johannes Zellner]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:100.0) Gecko/20100101 Firefox/100.0

Steps to reproduce:

Open mail view and hover over the message list and folder tree view.
This is on Linux Wayland Gnome, but same is happening on X11 without a desktop environment.

Actual results:

Both tree views in the email account/folder view and the actual message list are very slow on scrolling and even on hovering items. By very slow I mean the rest of the UI is performing normally fast as other apps. Not sure how to better measure this. In the dev tools I can only see normal but slow relayouts on hover. The DOM component in the inspector is in both cases "treechildren" (and for some reason I can't expand those nodes further)

Expected results:

Expectation would be to have normal framerates for example while hovering the list entries like hovering other UI components and lists in Thunderbird.

Comment 1

[Johannes Zellner]

Also please let me know if and how I could provide better information on the situation. I just tried version 101.0b2 (from archlinux user repo) and it has the same issue with the treeview performance. Maybe also relevant, but also maybe just obvious, the issue becomes a lot more visible while I am running on large resolutions like on a 4k monitor with a maximized window, so this may be rather a drawing performance issue rather than just layout computing.

Comment 2

[Magnus Melin [:mkmelin]]

This is indeed a duplicate. The <tree> widget uses other rendering than all other elements... We're going to replace it in next year.

Comment 3

[Johannes Zellner]

Thanks for the hint. Whats the tracking issue for that replacement work, if any for reference?

Comment 4

[Magnus Melin [:mkmelin]]

I guess bug 1724841

Comment 5

[Johannes Zellner]

Thanks, will mark this as "duplicate" then and track the other issue.