Android 4 list is performing worse in ST2 then ST1 (slow scroll)

[MaciejZabielski]

It's not only android... I have simillar problems on both Android 2 (dual core fast phone) and iOS5 (single core iPad). I havent seen your issue before, so I have another one that was registered as a bug. It's abig problem for us as well, a lot of work invested and we have to keep the release "frozen" for as long as ST2 becomes stable.
And it worked fairly good in ST1.... Now you can only make extremely simple layouts like samples in api docs... but that''s not how real apps look like....

http://www.sencha.com/forum/showthre...exts-truncated

[gubarez]

Hybrid app performance is not any better is it? I thought UIWebView in Jelly Bean was still using older browser code

Actually, UIWebView is performing better than native browser on JB... or at least it looks so . And thanks God, it is much much better than ICS... even, over Gingerbread, JB rocks.

After having a result, it is time, the great Sencha team to get their hands on and share the "even smoother scroller" 2.1 feature :P

[jbondc]

I don't understand the sencha touch code:

Ext.define('Ext.util.translatable.CssTransform', {
    extend: 'Ext.util.translatable.Dom',

    doTranslate: function() {
        this._element.dom.style.webkitTransform = 'matrix(1,0,0,1,' + this.x + ', ' + this.y + ')';
    },

Shouldn't that be:

   
doTranslate: function() {
        this._element.dom.style.webkitTransform = 'translate3d(' + this.x + 'px, ' + this.y + 'px, 0)';
},

I've noticed that in the CSS, translate3d only applies to iOS:

.x-ios .x-scroll-scroller{-webkit-transform:translate3d(0, 0, 0)}

// change to
.x-scroll-scroller{-webkit-transform:translate3d(0, 0, 0)}

The scrolling is now much smoother, I imagine hardware acceleration is kicking in properly.

This is on android ICS 4.0.3, I'm not sure how this impacts other versions.

I'm not using any animations so I don't know if there could be a side effect.

[siebmanb]

jbondc your solution does not work for me. The javascript code has been changed by Sencha, however the "wrong" css was still in place.

Jamie Avins was talking about a major improvement with ST 2.1. I just deployed an app using ST 2.1.0-b2, and I still have really slow scrolling on Android...

Any idea ? I believe I tried all the solutions I can get my hands on...

Thanks a lot

[cchilds]

According to the release notes, the list performance improvements have not been included yet for what ever reason. I have 2 apps waiting on that single feature alone for the last few months.

[Jamie Avins]

The new list will be in the next beta, we have also throttled some of Android 4's over zealous events in the scroller which does help performance as well. Once the new list in in place, we would like to get as much detail as possible on any issues so we can get them resolved.

I know that matrix transform mentioned earlier was put back to translate. I believe in beta 2.

[siebmanb]

Thanks a lot for the heads up, I was going crazy, trying again every solution found online. You never found any tricks to improve scrolling even a little ?

In our case, scrolling starts when your finger leaves the screen or stops. Which means you can't slowly scroll a list. Do you experience the same thing ?

[hotdp]

In our case, scrolling starts when your finger leaves the screen or stops. Which means you can't slowly scroll a list. Do you experience the same thing ?

You are not alone out there...

I hope B3 is soon?

Can't wait to see all the improvements.

[rkraus]

I am looking forward beta 3 too ;-)

[matt_m]

Hello. I was just pointed to this thread concerning List performance issues by Mitchell Simoens - so a bit late to it. I have a bit of a dumb question. It doesn't look like the list performance improvements were added in the released beta, so I can't answer/try this myself. So I'll ask.

Jamie Alvins said the new List widget can handle stores with thousands of items. Great news. My question is if the store loads urls to show an image within each list item, will the new List widget only download/load the images as they are needed/made visible?

- Matt