Hi, All, My suggestion is that you are using contentHeight property to calculate total height of the list (for scrollbar implementation). This causes loading all of delegates (visible and not visible) in the list. Please try to remove your scrollbar implementation and check performance once again. Maybe it could help
Best regards, Michael On 5 April 2011 21:34, Adriano Rezende <[email protected]>wrote: > On Tue, Feb 8, 2011 at 11:55 AM, Adriano Rezende > <[email protected]> wrote: > > On Tue, Feb 8, 2011 at 4:21 AM, <[email protected]> wrote: > >>> -----Original Message----- > >>> From: ext Adriano Rezende [mailto:[email protected]] > >>> Sent: Tuesday, 8 February 2011 1:57 AM > >>> To: Jones Martin (Nokia-MS-Qt/Brisbane) > >>> Cc: [email protected] > >>> Subject: Re: [Qt-qml] ListView (optimization flags) > >> I agree that it is worthwhile investigating this again. We simply > didn't pursue it at the time since it wasn't a straight forward gain and we > had other more pressing problems to solve (actually we spent a lot of time > minimizing component creation time since it both benefitted delegate > creation and QML loading in general). > > > > Yes, there are still more important issues than this one. I've just > > pointed this out as an improvement/investigation for future releases. > > Just as a feedback, we've made some benchmarks using the last QML > ListView and it seems much faster now :) > > We've created a simple QML ListView, which we used in the benchmark: > > > https://gitorious.org/openbossa-playground/qml-simplelistview/commits/master > > The performance of the QML ListView is currently equal to the simple > ListView (running on N8 devices, both can reach 60 fps and on 5800 > devices they reach 17 fps - sadly). > > I've also tested a pure C++ ListView in 5800 to check if the > bottleneck were in the property bindings. However, the result was the > same: 17 fps. > > Since Symbian is a good platform for profiling (I'm obviously joking > :)), for now I can only assume that the bottleneck resides in QGV > and/or QPainter. > > Br, > Adriano > _______________________________________________ > Qt-qml mailing list > [email protected] > http://lists.qt.nokia.com/mailman/listinfo/qt-qml >
_______________________________________________ Qt-qml mailing list [email protected] http://lists.qt.nokia.com/mailman/listinfo/qt-qml
