Hello, are there still any ways to increase UI performance on macOS? (Qt 5.9.1) You can see it already when the main window is enlarged. QListWidget scrolls very slowly. Full-screen operation is no longer working properly. HighDPI is activated. Under Windows and Linux, however, everything works smoothly and quickly. Mac does not feel native. Sample: The function elidedText in the "paint" event (QAbstractItemDelegate) makes it embarrassed slowly on 4k resolution. On a MacBook it runs well, since this has a lower resolution. My current conclusion is that Qt applications on Retina 4k / 5k perform very badly. Of course, I've also looked at other programs that were made with Qt. SqliteBrowser for example, it jerks also on higher resolution extremely. I'm at the moment helpless and afraid that it will remain so. Maybe I overlooked a trick? I've noticed that the wider the QListWidget, the slower it gets. For better view i have made a video as no listet on YouTube, please take a look :) https://www.youtube.com/watch?v=PMwHZ0FSMLI Hardware: iMac (Retina 5K, 27 Zoll, End 2015) 3,3 GHz Intel Core i5 16 GB 1867 MHz DDR3 512GB SSD HardDrive AMD Radeon R9 M395 2048 MB

Hi, You should rather bring this to the interest mailing list . You'll find there Qt's macOS port developers/maintainers. This forum is more user oriented.

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Bad Performance under macOS

Unsolved General and Desktop

2 Posts 2 Posters 633 Views 1 Watching

R Offline
R Offline
roundcubes

wrote on last edited by

#1

Hello,

are there still any ways to increase UI performance on macOS? (Qt 5.9.1)

You can see it already when the main window is enlarged. QListWidget scrolls very slowly. Full-screen operation is no longer working properly.

HighDPI is activated. Under Windows and Linux, however, everything works smoothly and quickly. Mac does not feel native.

Sample: The function elidedText in the "paint" event (QAbstractItemDelegate) makes it embarrassed slowly on 4k resolution.

On a MacBook it runs well, since this has a lower resolution.

My current conclusion is that Qt applications on Retina 4k / 5k perform very badly.

Of course, I've also looked at other programs that were made with Qt. SqliteBrowser for example, it jerks also on higher resolution extremely.

I'm at the moment helpless and afraid that it will remain so. Maybe I overlooked a trick?

I've noticed that the wider the QListWidget, the slower it gets.

For better view i have made a video as no listet on YouTube, please take a look :)
https://www.youtube.com/watch?v=PMwHZ0FSMLI

Hardware:
iMac (Retina 5K, 27 Zoll, End 2015)
3,3 GHz Intel Core i5
16 GB 1867 MHz DDR3
512GB SSD HardDrive
AMD Radeon R9 M395 2048 MB
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S Offline
S Offline
SGaist
Lifetime Qt Champion
wrote on last edited by

#2

Hi,

You should rather bring this to the interest mailing list. You'll find there Qt's macOS port developers/maintainers. This forum is more user oriented.
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Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct
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