Performace Problem with Text

[fyDe]

Hello there,

at the moment i struggle with some Performance Problems of my App I Develop in QML.

I generated a new example Qt Quick-UI so demonstrate my problem

@import QtQuick 2.2

Rectangle {
width: 360
height: 360
Text {
anchors.centerIn: parent
text: "Hello World"
}
MouseArea {
anchors.fill: parent
onClicked: {
Qt.quit();
}
}
}@

The Problem is, that the generating of the Text takes 1.808s
Heres a Screenshot of the QML-Profiler:
!http://ngleichauf.de/download/screen.png(Screenshot)!

How can i fix this issue?

Thanks

[sierdzio]

You are asking about initialisation performance: I doubt you can do anything there.

Please try with changing "renderType":http://qt-project.org/doc/qt-5/qml-qtquick-text.html#renderType-prop property. It can have big impact on runtime performance, although I doubt it will change much in the initialisation time.

[fyDe]

Oh i forgot to mention that I already tried to set the renderType.
This Code changes nothing. The Time is 1.811s.

@import QtQuick 2.2

Rectangle {
width: 360
height: 360
Text {
anchors.centerIn: parent
text: "Hello World"
renderType: Text.NativeRendering
antialiasing: false
smooth: false
}
MouseArea {
anchors.fill: parent
onClicked: {
Qt.quit();
}
}
}@

My sytem is Mac OS X 10.9.2 on on MacBook Pro Retina 2012

[Xander84]

Hi, I tried your example on windows and it takes like 20 ms to create the Text element. Still by far the slowest item but nothing compared to your time!?

!http://i60.tinypic.com/r2kfa8.jpg(qml profiler)!

[fyDe]

I just tested it on Windows 7 too.
The time is 5.2 ms this would be all right. But almost 2 seconds? I don't understand what im doing wrong.

[Jens]

I think there has been reported performance issues in particular when loading the QFontDatabase data at startup, which would have no relation to rendering time. That said I have never heard about performance as bad as this so it might be worth reporting.
A few points though:

• make sure you don't compare performance using a debug build
• if its the font database this should be a one time cost. Consecutive instances for Text would be much faster.
• the amount of fonts installed might affect the performance. Do you have a lot of fonts installed on the mac?

[fyDe]

Thanks for your answer and your hints.
I think you are right. Further texts do not impact the Time in the way the first does.
!http://www.ngleichauf.de/download/screen2.png(screenshot)!

I now don't have any additional fonts installed on my Mac, i ensured it and deleted all the additional fonts i installed.

The problem is also there if I build the release of the program.

Also if it is a one time cost to load the font database it takes much to long in my opinion, in which the problem is not there when using windows.

I use a splash screen at the moment to load the main content in background, but this is only necessary because the first text loads this long.

Thanks!
Greets Nico

[fyDe]

Hey,

i just installed the 5.3.0 RC.
The problem is solved with this release.

Thanks!

Greets Nico