Re: [Interest] QQuickProviders and proper drawing / caching?

source: "reallyBigImage.jpg" sourceSize.width: 1024 sourceSize.height: 1024 } } Regards, Gunnar Roth -- Original Message -- From: "Jason H" To: "interestqt-project.org" Sent: 26/02/2019 19:42:42 Subject: [Interest] QQuickProviders and p

Re: [Interest] QQuickProviders and proper drawing / caching?

ource: "reallyBigImage.jpg" sourceSize.width: 1024 sourceSize.height: 1024 } } Regards, Gunnar Roth -- Original Message -- From: "Jason H" To: "interestqt-project.org" Sent: 26/02/2019 19:42:42 Subject: [Interest] QQuickProviders and proper dra

Re: [Interest] Faster QXmlStreamWriter?

here? Regards, Gunnar Roth ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Use Qt release DLLs while debugging application

delete with the release allocator or vice versa. Regards, Gunnar Roth -- Original Message -- From: "Hamish Moffatt" To: "interest@qt-project.org" Sent: 24/04/2018 07:34:20 Subject: [Interest] Use Qt release DLLs while debugging application This must be an FAQ,

Re: [Interest] Performance comparison of painting methods

>On 13.11.2017 17:12, Jean-Michaël Celerier wrote: >> http://kgronholm.blogspot.fr/2017/11/qt-510-qml-shape-testing.html >> >> An interesting blog post which compares QPainter, the upcoming QML >> Shapes and QNanoPainter. I'm surprised to see QML Shapes perform so >> much slower than good old QP

Re: [Interest] Windows 5.9 Build System Library Failures

I have the similar problem with LIBJPEG. Qt support confirmed me that it is a bug, but they don’t know what kind and how to fix it yet. Regards, Gunnar Roth > Am 10.07.2017 um 13:28 schrieb John Schneiderman : > > I’m trying to build the latest Qt 5.9 on Windows using Visual St

Re: [Interest] Tired of QML

Ok Shawn, my confusion is perfect now. Is it really the case that QQuickItem::parent is a different function than QObject::parent and if  "QQuickItem::parent is about placement in the scene." what is QQuickItem::parentItem then?   Regards, Gunnar Roth   Gesendet: Dienstag, 18.

[Interest] constexpr construct a QLatin1String from a raw string literal

variable like Q_CONSTEXPR Latin1Literal MY_PREFIX("Prefix"); My question is now, is this the right thing to do and could something like that be added to Qt itself? Regards, Gunnar Roth ___ Interest mailing list Interest@qt-project.org http://list

Re: [Interest] How do you want to select exactly C++11 with GCC 6+?

> > > Except that we can't do that with MSVC, since you can't toggle the features > on > or off. Well the truth is that since vs2015 upd3 and later support the /std:c++14 and /std:c++lat

Re: [Interest] Qt in browser with emscripten

There is also something new here https://codereview.qt-project.org/#/c/178543/ WIP: Introduce mkspec for web assembly Regards, Gunnar Roth   Gesendet: Freitag, 10. Februar 2017 um 09:44 Uhr Von: "Viktor Engelmann" An: interest@qt-project.org Betreff: Re: [Interest] Qt in br

Re: [Interest] Beautifier for QML

> i I was wondering if anything similar existed > for QML? 1. Look under menu extras/qml/js in QtCreator there is a format code entry. It is a bit sad , that you cannot assign the same key combination to c++ formatting as to qml/js formatting. You also cannot make qtc format qml/js code on sa

Re: [Interest] Qt 5.8.0 RC build under windows

og says 5.8.0 has initial support for vs2017, it does not compile, so initial support in the qt world does not necessarily mean it compiles ;-) but you can get the file from the 5.8 branch , which will become 5.8.1, there it is fixed. Regas, Gunnar Roth ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Qt 5.8.0 RC build under windows

o problem compiling 5.8.0rc with vs2015 upd3 ( well angle crashes, my latest assumption is use of ltcg ) it brings its own win10 sdk. I am also able to compile with vs2017rc ( using a patch from 5.8). Regards, Gunnar Roth ___ Interest mailing list

Re: [Interest] Android: WARNING: QApplication was not created in the main() thread.

class. Your map is created before entering main, where QApplication is created. If you need that kind of globals, try using Q_GLOBAL_STATIC, which will created the global singleton on demand in a thread-safe manner.. Regards, Gunnar Roth ___ Inter

Re: [Interest] Qt 5.6.2 Git on Windows: -force-debug-info configure option triggers linker warning on usage

       project->values("QMAKE_CLEAN").append(pdbfile); -        // Add the linker's PDB file to the distclean target. -        project->values("QMAKE_DISTCLEAN").append(tgt + ".pdb"); +        project->values("QMAKE_DISTCLEAN").append(distPdbFile)

Re: [Interest] [5.8] how to use qml caching?

of time compilation. If you are on the same kind of machine for building and running your application,you could write your own training code by instantiating your qml components one after another and collect the cache files for later use. But it is not supported yet afaik. > thanks a lot, &

Re: [Interest] [5.8] how to use qml caching?

speed up loading of QML applications once the binary cache has been created. It also helps reduce memory consumption. Ahead of time compilation of Qt Quick continues to be supported through the commercial Qt Quick Compiler. Regards, Gunnar Roth > Am 14.11.2016 um 15:42 schrieb Tim Blechm

Re: [Interest] Thoughts on a 'proper' (or standard) file/io API for QML?

> Am 15.08.2016 um 17:30 schrieb Jason H : > > > >> Sent: Wednesday, August 10, 2016 at 4:36 PM >> From: "Alejandro Exojo" >> To: interest@qt-project.org >> Subject: Re: [Interest] Thoughts on a 'proper' (or standard) file/io API for >> QML? >> >> On Wednesday 10 August 2016 17:09:17 Jason H

[Interest] QString , QStringLiteral, QLatin1String, char16_t and u" my char16 string literal"

if   The #else case does only work on windows or where wchar_t is 2 bytes on other systems build fails.     Regards, Gunnar Roth ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Compiling Qt from source 64 bit on Windows

visual studio. Regards, Gunnar Roth > Am 14.03.2016 um 21:45 schrieb Thiago Macieira : > > On segunda-feira, 14 de março de 2016 18:11:46 PDT Nuno Santos wrote: >> Hi, >> >> Is there any special difference in compiling Qt from source in Windows >> in 64 bit

Re: [Interest] QML Promises

Maybe have a look here https://github.com/benlau/quickpromise <https://github.com/benlau/quickpromise> Regards, Gunnar Roth > Am 10.03.2016 um 23:31 schrieb Jason H : > > Are promises scheduled to come to QML anytime soon? (5.6/5.7)? > > The more code I write in JS, the

Re: [Interest] QT Windows CE Commercial Editions Only?

Regards, Gunnar Roth > Am 10.03.2016 um 16:01 schrieb Bruno Pastore : > > Hello, > How can I try QT on a Windows Embedded device? > Only with Commercial Editions licence? > > Let me know > > Thank in advance > > ___

Re: [Interest] How can I build qt-Windows using WMF as multimedia backend?

Hi, by executing configure -help you get all options available. So pass -wmf-backend to configure. but be prepared that wmf backend will be removed in 5.7. Regards, Gunnar Roth > Am 05.03.2016 um 09:26 schrieb Liang Jian : > > Start from Qt-5.6, DirectShow is used as th

Re: [Interest] Minimal MSVC-built ICU DLLs available for download

> > Woah. So all this work for nothing, I can simply skip shipping the ICU > > DLLs? I'm only using QtCore. Oh well, then I learned something :) > Maybe you should use depends.exe from dependancywalker.com to have a look which dlls are really demanded from an exe or dll next time ;-) Regards,

[Interest] anyone knows example code for implementation of a model property in custom quick item?

nyone who is interested. Is there any other sample to see how to correct implement such a thing, when using the data for drawing something and not instantiating delegates? Regards, Gunnar Roth ___ Interest mailing list Interest@qt-project.org htt

Re: [Interest] Display color managed image

Well sounds cool, but on my mac book i only get a black square when loading even the sample image. > Am 31.12.2015 um 14:19 schrieb Boudewijn Rempt : > > On Thu, 31 Dec 2015, Gunnar Roth wrote: > >> Hi,doing my regular github scan for qml keyword, >> I just found

Re: [Interest] Display color managed image

ing 32 bit per channel floating point framebuffer and layer support for optimal compositing, manipulation, and display of HDR and high-depth images, including in 30-bit mode (10 bit per channel). Hth, Gunnar Roth > Am 30.12.2015 um 23:25 schrieb Caio S. Souza : > > Hi! > I posted th

Re: [Interest] Why does a single Text item increase start-up time of QML application by 21 seconds?

Very probable. The fix  Windows: Introduce delayed population to the FreeType font database. https://codereview.qt-project.org/#/c/106411/ explictly states:  The Windows CE version is unchanged.   Nobody explains why.   Regards, Gunnar Roth   Gesendet: Freitag, 13. November 2015 um 14

Re: [Interest] Why does a single Text item increase start-up time of QML application by 21 seconds?

features in combination with the NativeRendering render type will lend poor and sometimes pixelated results. > > From: Gunnar Roth [mailto:gunnar.r...@gmx.de <mailto:gunnar.r...@gmx.de>] > Sent: Thursday, 5 November 2015 17:15 > To: Christian Nielsen > Cc: interest@q

Re: [Interest] Why does a single Text item increase start-up time of QML application by 21 seconds?

ur program like       \\myprogram.exe -qmljsdebugger=port:12345,block 6. In the open qml profiler dialog box, press ok.   Regards, Gunnar Roth   Gesendet: Donnerstag, 05. November 2015 um 08:33 Uhr Von: "Christian Nielsen" An: "Curtis Mitch" , "interest@qt-projec

Re: [Interest] Why does a single Text item increase start-up time of QML application by 21 seconds?

Nice catch. My wild guess is font initialization. Regards, Gunnar Roth > Am 05.11.2015 um 07:52 schrieb Christian Nielsen > : > > > I am thinking that the issue is not the loading of the dlls. Because Widget > application and Qt Quick Rectangle application loads fast enough.

Re: [Interest] Solution to Qt 5.5.1 build fails on win7 in qt3d with fatal error C1083: Cannot open include file: 'zlib.h': No such file or directory

: LIBS += zdll.lib } else { INCLUDEPATH += $$[QT_INSTALL_HEADERS/get]/QtZlib } So I replaced the fragment in assimp.pri by the one from svg.pro. Et Voila, it works now. Regards, Gunnar Roth >My build fails with >C:\RTIL\Shared\Qt\5.5.1\qt-src\qt3d\src\3rdparty\assim

Re: [Interest] QtQuick under Windows Remote Desktop?

angle and uses angle when doing a remote desktop connection. AFAIK current qt msvc build binaries also are build with opengl dynamic option.   Regards, Gunnar     Gesendet: Montag, 19. Oktober 2015 um 14:35 Uhr Von: "Michael R Nelson" An: "Gunnar Roth" , "Shantanu

[Interest] Qt 5.5.1 build fails on win7 in qt3d with fatal error C1083: Cannot open include file: 'zlib.h': No such file or directory

t. I took the src from  downloaded qt5.5.1 enterprise tar.gz.   Regards, Gunnar Roth             ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] QtQuick under Windows Remote Desktop?

Why don’t you give us the Version of Qt, you are using ? What windows version? Did you build qt yourself? What is your configure line , if yes? Regards, Gunnar > Am 17.10.2015 um 14:36 schrieb Michael R Nelson : > > Hello, > > I would like our QtQuick app to be viewable/usable over Windows Re

Re: [Interest] ImageProvider Threading

ay want to return with a standard "Loading image..." image for those images that are not found "slowly" in the background. So what must be done is a way to cause Image { } to get refreshed later after they return a temporary image just for speed purposes. Thanks, md On 9

Re: [Interest] ImageProvider Threading

Hi Mark, I think it is serial. In Qt 5.6 there will be a new QQuickAsyncImageProvider class, with it you can do parallel image loading/rendering. Regards, Gunnar Roth Gesendet: Freitag, 18. September 2015 um 02:29 Uhr Von: "mark diener" An: "interest@qt-project.org"

[Interest] Why das rcc -list my.qrc appen CRCRLF ?

to do a \r\n to ; replace but that also didnt work, then i found that rcc is adding \r\r\n to the lines. Why?   Best regards, Gunnar Roth ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Qt5.5, VS2013 chain, compile warnings and linking errors

I hardy believe Windows v7.1A sdk is going to work with VS2013. AFAIK VS 2013 RTM includes the Windows Software Development Kit (SDK) forWindows 8.1 Why don’t you just remove the old sdks patches from your .pro file and retry? regards, Gunnar Roth > Am 14.09.2015 um 17:58 schrieb Ja

Re: [Interest] Qt 5.5.0 compilation on Windows with MSVC 2013

Do you have perl and python in PATH?   Gesendet: Freitag, 11. September 2015 um 15:03 Uhr Von: "Igor Mironchik" An: "interest@qt-project.org" Betreff: [Interest] Qt 5.5.0 compilation on Windows with MSVC 2013 Hi. Where to find the problem? Thank you. Creating library D:\thirdparty\Qt\5.5.0\qt

Re: [Interest] Qt 5.5.1 & MSVC 2015

    >> Mark i don’t know which problem you have and why, but i was able to do a >> shadow build of qt 5.5.0 with vs 2015. But i did not use openssl and no >> icu. So no webkit. No webengine, i did a post about this in the making >> list. All other worked out of the box. >That wasn't a webkit er

Re: [Interest] Qt 5.5.1 & MSVC 2015

Mark i don’t know which problem you have and why, but i was able to do a shadow build of qt 5.5.0 with vs 2015. But i did not use openssl and no icu. So no webkit. No webengine, i did a post about this in the making list. All other worked out of the box. Regards, Gunnar __

Re: [Interest] prebuild packages for windows and pdb

> Am 14.08.2015 um 13:20 schrieb Felix morack : > > which means we have to build our own Qt version, which lead to binary > compatibility issues. This is because? Actually pdb for release builds were never delivered at least for qt5 and without this you cannot debug or profile release builds

Re: [Interest] Qt .dlls size reduction

fewer > entries. > Not using icu on windows at all seems to me the better option. Or what do I lose? Regarda, Gunnar Roth ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Qt .dlls size reduction

w.matcode.com/mpress.htm> > I see today that a Mac version is also available. > > Philippe > > On Fri, 7 Aug 2015 23:06:01 +0900 > Gunnar Roth mailto:gunnar.r...@gmx.de>> wrote: > > Hi Philippe > May i asked what the advantage is against a 7z compressed msi file

Re: [Interest] Qt .dlls size reduction

Hi Philippe May i asked what the advantage is against a 7z compressed msi file? If you remove code from code it gets smaller because you can still apply compression afterwards and it gets even more smaller. These exe compactors do not reduce the used RAM memory when loaded actually afaik more mem

Re: [Interest] Qt .dlls size reduction

Hi Jérôme. You can compile qt without icu at all, simply do not pass -icu to configure. If raphael needs to use QtWebkit, all dll size reductions will be much less effective percentage wise. Regards, Gunnar Roth > Am 07.08.2015 um 22:48 schrieb Jérôme Godbout : > > "I have task

Re: [Interest] Qt .dlls size reduction

. Regards, Gunnar Roth > Am 07.08.2015 um 22:31 schrieb Rafael Machado > : > > Hi everyone > > This is my first question on this mail list, so sorry for possible trivial > questions. > > I have task to reduce the size of an installer of an application from my > com

Re: [Interest] Qtcontainerbench std::vector vs QVector

oose QVector only when you really need the implicit sharing. Regards, Gunnar Roth ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Need argumentative help..... giving qobject copy/assignment constructor and put it in qlist/qmap

r type is converted to a smaller integer type. This is a level-4 warning if type1 is int and type2 is smaller than int. Otherwise, it is a level 3 (assigned a value of type __int64 <https://msdn.microsoft.com/en-us/library/29dh1w7z.aspx> to a variable of type unsigned int). A possible loss

Re: [Interest] Qtcontainerbench std::vector vs QVector

> Am 23.07.2015 um 07:00 schrieb Constantin Makshin : > > "vector" branch is identical to "master“. Not anymore ;-) Thanks for the information. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Need argumentative help..... giving qobject copy/assignment constructor and put it in qlist/qmap

Hello Thiago. > > Of those, C4275, C4514, C4800, C4097, C4786 and C4710 are stupid. I can't see > anyone who wants to know those warnings. > Most are sure, but sometimes you need this diagnostic and you wonder why you cannot switch it on. > I'll concede we may have gone too far on C4244 and C

Re: [Interest] Need argumentative help..... giving qobject copy/assignment constructor and put it in qlist/qmap

Hello Thiago. > Am 22.07.2015 um 22:45 schrieb Thiago Macieira : > > On Wednesday 22 July 2015 20:51:21 Gunnar Roth wrote: >> You are completely right, albeit there is a macro you can define so qt does >> not switch of the warnings, but then you get warnings, bad if you com

Re: [Interest] Need argumentative help..... giving qobject copy/assignment constructor and put it in qlist/qmap

> > For my company, when I first joined, the Idea of compiled with -Werror (or > the equiv on VC++) was so far down the road, that I thought it would never be > possible. We had close to 5000 warnings between windows and linux. Lucky man, i once worked in a project where we had 7 warnings

[Interest] std::vector vs Qvector part 2

Hi, i forget to mention that the container data, was a struct containing a String and an int32_t, which has a sizeof == 16. Now i Made a test with a strut with 2 int32_t, with a sizeof == 8. the result are for both container a lot faster even for iterating , is it because of the smaller size?

[Interest] Qtcontainerbench std::vector vs QVector

Vector. Regards, Gunnar Roth ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Need argumentative help..... giving qobject copy/assignment constructor and put it in qlist/qmap

Hi Scott. > > While I 100% agree, one thing I really cant stand, is when 3rd party vendors, > DISABLE WARNINGS in their code, and don't re-enable them when their code > exits (Im looking at you Qt). > > Im not a g++ guru, but in VC++ #pragma( push) and #pragma( pop ) should be a > requirement

Re: [Interest] Need argumentative help..... giving qobject copy/assignment constructor and put it in qlist/qmap

Well here people who write that kind of code become project lead or product managers , so they can no longer harm the code ;-) > Am 21.07.2015 um 18:34 schrieb Guido Seifert : > > > >> > >> hi, >> >> i wonder why you just don't store QObject* in the lists? >> moving from objects to pointers

Re: [Interest] Need argumentative help..... giving qobject copy/assignment constructor and put it in qlist/qmap

gt; On Mon, 20 Jul 2015 18:41:16 +0200 > Gunnar Roth wrote: > >> Hi, >> well i think thats even worse. You have to call the base class copy >> constructor in any derived copy constructor but you cannot as it is private >> ( and even not implemented), >> so that

Re: [Interest] Need argumentative help..... giving qobject copy/assignment constructor and put it in qlist/qmap

Hi Guido, you mean they have patched qt and gave Object an assignment operator and copy constructor? Really? Regards, Gunnar > Am 20.07.2015 um 14:51 schrieb Guido Seifert : > > Hi, just seen this in project's code. Worse, I have been told to do it > exactly this way in another code part. I m

Re: [Interest] Test failures are not reported in -csv mode

um 22:16 schrieb Gunnar Roth : > > Hi, > i wondered for some hours why some of my benchmark tests do not output any > result. > Debugging in qt was hard as there seem to be no sufficient debug symbols for > mac OS X delivered with qt 5.5 similar to having no pd. on windows.

[Interest] Test failures are not reported in -csv mode

Hi, i wondered for some hours why some of my benchmark tests do not output any result. Debugging in qt was hard as there seem to be no sufficient debug symbols for mac OS X delivered with qt 5.5 similar to having no pd. on windows. Usually I build qt myself, but since the introduction of webengi

Re: [Interest] Memory leak in QML Image

I think there is a cache in QtQuick2 of about 2mb size which holds unreferenced images. So you should at least find that the memory usage is saturating after a while. Regards, Gunnar Roth > Am 07.06.2015 um 17:03 schrieb Igor Mironchik : > > Hi, guys again. I'm sorry but qu

Re: [Interest] Camera not worknig on IOS

Maybe just wait for qt 5.5 release? To me it looks as if this bug will be fixed in 5.5, see https://codereview.qt-project.org/#/c/109116/ <https://codereview.qt-project.org/#/c/109116/> Regards, Gunnar Roth > Am 31.05.2015 um 01:27 schrieb Daniel França : > > Quite disappoin

Re: [Interest] Finding the root QQuickItem in a QQml(Application)Engine

I thought engine.rootObjects().first() would be the root item.     Gesendet: Montag, 11. Mai 2015 um 15:06 Uhr Von: "Sze Howe Koh" An: "interest@qt-project.org" Betreff: [Interest] Finding the root QQuickItem in a QQml(Application)Engine Hello,   Is there an analogue of QQuickView::rootIte

[Interest] qml flickable on wince does no longer flick in qt 5.5 git

Hello, up to qt 5.4.1 i  could rather nicely flick a flickable on our single touch device. but using recent qt 5.5 no flicking but just move is possible anymore. Anybody got a clue what happening here?   I read http://www.kdab.com/current-state-windows-embedded-compactwec-platform-support-qt/ a

Re: [Interest] QVariantMap: constEnd() not equal to end()?

Does anybody know why QT_STRICT_ITERATORS is not standard? Regards, Gunnar     Gesendet: Dienstag, 24. März 2015 um 11:28 Uhr Von: "Jan Kundrát" An: interest@qt-project.org Betreff: Re: [Interest] QVariantMap: constEnd() not equal to end()? On Friday, 20 March 2015 07:25:48 CET, Aleksandr M

Re: [Interest] QML ListModel of ListModels?

Why not use a list view with sections? see http://doc.qt.io/qt-5/qml-qtquick-listview.html#section-prop > Am 23.03.2015 um 22:48 schrieb Jason H : > > In a flickable, I want to have a 2-layer hierarchy: > Category 1 > Item 1 > It

Re: [Interest] Bounties?

st ;-) Regards, Gunnar Roth   ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Bounties?

Hi Thiago, > Am 12.03.2015 um 16:56 schrieb Thiago Macieira : > > As QtCore maintainer, I resent that. I fix almost every real bug in QtCore > almost immediately. > Sadly my long standing qtcore-bug seems to fall into the other category. Its QTBUG-27765 QSharedMemory loses the error condition o

Re: [Interest] Can QML do this animation?

Thanks a lot for this nice example. I just could not get to work it doing failure case. var amount = [ 18, 10, 15, 57 ];//insert -1 to cause failure inserting -1 here just shortens the animation, still done is shown not fail. Regards, Gunnar Roth > Am 27.02.2015 um 16:12 schrieb Art

[Interest] QSaveFile on wec7 commit() fails

hen  the source file is deleted and then it is renamed. that sound like doing it in the wrong order. Regards, Gunnar Roth ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Info: QuickControls plugin load qml files from ressources

be used with the quickcompiler.   Regards, Gunnar     Gesendet: Montag, 15. Dezember 2014 um 14:09 Uhr Von: "Gunnar Roth" An: "Interest@qt-project.org" Betreff: [Interest] Info: QuickControls plugin load qml files from ressources Hi all, i just found out by browsing th

[Interest] Info: QuickControls plugin load qml files from ressources

Hi all, i just found out by browsing the qt code that there is a logic in quickcontrols to load the qml files from resources, if some qml file cannot be found in the file system. So you can just remove the qml files when deploying the app and they will be still available from dll resources, whi

Re: [Interest] QML instantiation performance

Hello, i would like to add that we have observed similar behaviour in our buildroot base embedded linux on a ti omap device. Our application consist of pages which are switched by the user and items are destroyed and created and the page switch time is important for us. We also still stay at Qt