[Interest] Performance of Qt 5.2 much slower than Qt 5.1?

[Sletta Gunnar]

Is the time spent rendering gone up or is it something else?

Generally, I see improved rendering performance across the board. If you run the code with QSG_RENDER_TIMING=1 you get some indication of the breakdown of where time is being spent.

Performance of javascript has gone down some since Qt 5.1 as a result of the replacement of the V8 java script engine with our own V4. Work on improving performance here is still ongoing.

cheers,
Gunnar

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Fra: interest-bounces+gunnar.sletta=digia.com at qt-project.org [interest-bounces+gunnar.sletta=digia.com at qt-project.org] på vegne av VStevenP [vstevenpavao at yahoo.com]
Sendt: 6. november 2013 15:33
To: interest at qt-project.org; David V-Play
Emne: Re: [Interest] Performance of Qt 5.2 much slower than Qt 5.1?

A colleague and I also see one performance issue with Qt 5.2 Beta as compared to Qt 5.1.

We observe a 20% jump in CPU usage with the FPS Item from the Cinematic Experience Demo.  This is the component which dynamically displays the number of frames per second and has a spinning graphic.  You can see it in action here:

https://www.youtube.com/watch?v=wulbR2R1GpM&feature=player_embedded#at=40

We observe this large increase in CPU usage due to the FPS Item on a BeagleBoard-xM/Angstrom.

If anyone has an idea why FPS Item would run far less efficiently in Qt 5.2 Beta on BB-xM, please let me know.

- VStevenP

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