[Interest] QtQuick 2 performance issue

[Dmitry Volosnykh]

I do not experience the same issue on Mac OS X 10.10.

PS. Sorry for bumping this up. Is this question out of scope of mailing
list?

On Fri, Dec 26, 2014 at 2:27 PM, Dmitry Volosnykh <
dmitry.volosnykh at gmail.com> wrote:

> Here is example application:
>
> import QtQuick 2.0
>
> PathView {
>     width: 1280
>     height: 720
>     cacheItemCount: 7
>     pathItemCount: 7
>     preferredHighlightBegin: 0.5
>     preferredHighlightEnd: 0.5
>     model: ListModel {
>         ListElement {
>             color: "orange"
>             text: "first"
>         }
>         ListElement {
>             color: "lightgreen"
>             text: "second"
>         }
>         ListElement {
>             color: "orchid"
>             text: "third"
>         }
>         ListElement {
>             color: "tomato"
>             text: "fourth"
>         }
>         ListElement {
>             color: "skyblue"
>             text: "fifth"
>         }
>         ListElement {
>             color: "hotpink"
>             text: "sixth"
>         }
>         ListElement {
>             color: "darkseagreen"
>             text: "seventh"
>         }
>         ListElement {
>             color: "salmon"
>             text: "eightth"
>         }
>         ListElement {
>             color: "darkolivegreen"
>             text: "nineth"
>         }
>         ListElement {
>             color: "navy"
>             text: "tenth"
>         }
>     }
>     delegate: Item {
>         width: 150
>         height: 150
>
>         Rectangle {
>             id: rect
>             anchors.fill: parent
>             color: model.color
>             opacity: 0.8
>         }
>
>         Text {
>             anchors.centerIn: parent
>             text: model.text
>             color: "white"
>             font.pixelSize: 24
>         }
>     }
>     path: Path {
>         startX: -150
>         startY: height / 2
>         PathLine {
>             x: width + 150
>             relativeY: 0
>         }
>     }
>
>     NumberAnimation on offset {
>         from: 0
>         to: count
>         loops: Animation.Infinite
>         duration: 4000
>         Component.onCompleted: start()
>     }
> }
>
> On Fri, Dec 26, 2014 at 2:19 PM, Dmitry Volosnykh <
> dmitry.volosnykh at gmail.com> wrote:
>
>> Hi,
>>
>> I've composed a simple example with a set of squares constantly looping
>> from left to right. Unfortunately, the do not run smoothly. Jiggling at
>> start might seem reasonable due to QML engine performing some kind of
>> initialization (do not know its internals). However, after a while when
>> initialization seems to be done, motion still gets freezed from time to
>> time. As a first guess, I could think that it is the garbage collector
>> affecting performance, but since UI structure does not change such
>> suggestion might be irrelevant.
>>
>> I see similar behavior when using qmlscene for Qt versions 5.1.1 and
>> 5.3.2 (Ubuntu 14.04), and 5.2.1 (embedded Linux).
>>
>> Can this be related to "QML instantiation performance" discussion
>> happened in the beginning of December? Maybe this is related
>> to QTBUG-43096. But in this case it should not be reproducible on version
>> 5.1.1.
>>
>> Regards,
>> Dmitry.
>>
>
>
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