1018143 - Performance issues when nesting flexboxes

Status: RESOLVED DUPLICATE of bug 946167

(Core :: Layout, defect)

Description

[oliverjash]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2019.0 Safari/537.36

Steps to reproduce:

Many nested flexboxes that contain a `contenteditable` element. See http://embed.plnkr.co/CvoWXin4bMNbyOVXRVwy/.


Actual results:

When typing inside of the `contenteditable`, it is clear that performance is really slow (the characters appear much later).


Expected results:

The performance should be good!

Comment 1

[dfern]

[bugday-20140602]

Tested in FF v 32.0a1 (2014-06-01) on Win 7 64

Confirmed

FF seems to have a delay that is not present in Chrome v35 or IE11.

Comment 2

[Daniel Holbert [:dholbert]]

I can reproduce in latest 64-bit Linux Nightly (reported as "32.0a1 (2014-06-02)" in Help|About)

Bug 946167 covers some perf issues with nested flexboxes, too.  Adding as a dependency, to connect the bugs for now.

Comment 3

[Daniel Holbert [:dholbert]]

Duping to bug 946167, since the perf issues seem to be the same.

In particular, bug 1015474 and its dependencies seem to have really helped with bug 946167, as noted in bug 946167 comment 22 -- and it looks like they also helped with this bug.  (I no longer see a noticeable delay when typing into the plnkr URL from comment 0.)