mdSubheader: High CPU usage with AngularJS 1.4.x

[izstas]

I was trying to use a sticky <md-subheader> and found out that on my page it appears to cause a high CPU usage when I try to scroll a container with subheaders. The subheader example at https://material.angularjs.org/latest/#/demo/material.components.subheader works just fine.

Here is the output of Chrome's CPU profiler:

.cpuprofile file

I am able to reproduce the problem with this CodePen on Chrome 43.0.2357.130, 45.0.2438.3, Microsoft Edge 20.10158.0.0. The page uses AngularJS 1.4.1 and Angular Material 0.10.0.

Is this a bug or am I trying to use the <md-subheader> in a wrong way?

[izstas]

It appears to work just fine with AngularJS 1.3.15. Still reproducible with AngularJS 1.4.2-build.4089+sha.d193c3a.

[izstas]

After further research, it appears that the issue is introduced by angular/angular.js@0adc036. The problem is reproducible with this version (https://codepen.io/izstas/full/rVJYMd/) and not reproducible with the previous one (angular/angular.js@1ee5861 - https://codepen.io/izstas/full/KpQyGQ/)

[ThomasBurleson]

@matsko, @jeffbcross, @jelbourn - The latest comment from @izstas seems to spotlight a raf.js issue. How should we more accurately report apparent AngularJS issues seen from Angular Material component usages ?

[jeffbcross]

@ThomasBurleson the issue should be opened on the angular.js repository with a reference to the original issue on angular/material. There should probably be some kind of "Material" label on angular/angular.js that could be applied to these kinds of issues to help track them. @petebacondarwin is that reasonable?

It'd probably be worth bringing up material-related issues in the internal angular-1 channel as well.

[petebacondarwin]

Yes, an issue should be created in Angular.js. I created a label called "hotlist: material" for this sort of thing.

[ThomasBurleson]

@petebacondarwin: I created angular/angular.js#12280. I could not assign a label, however, since I am not a contributor to that repos. Would it be possible to add me as a contributor so I can manage issues from Angular Material - to - AngularJS ?

@jeffbcross - Thx