22.03.2019, 19:08, "Allan Sandfeld Jensen" <k...@carewolf.com>: > On Freitag, 22. März 2019 12:46:59 CET Denis Shienkov wrote: >> Hi guys. >> >> I have iMX6 board with Qt 5.11.2 and Qt-widgets based application. I have >> compiled my Qt with an 'xcb_native_painting' option. >> >> I was hoping that this would speed up my UI and reduce the load on the CPU, >> but I was greatly mistaken: >> >> When the QT_XCB_NATIVE_PAINTING is not set, I got following top: >> >> * Xorg: 3.6 % >> * app: 12.8 % >> >> When the QT_XCB_NATIVE_PAINTING is *set*, I got following top: >> >> * Xorg: 23 % >> * app: 4.5 % >> >> What? QT_XCB_NATIVE_PAINTING makes it worse in 2x-times... WTF? > > Sounds like XCB isn't as well optimized as Qt is ;) > > Note though, that there are number of techniques to make the native painting > faster, such as always using qpixmap so the images stays buffered on the > server side. You might be able to massage your program to be faster with > native painting, but the whole reason for switching to Qt side painting was > that for the average application developer Qt side was faster.
Native painting should be most beneficial when using remote X11 -- Regards, Konstantin _______________________________________________ Development mailing list Development@qt-project.org https://lists.qt-project.org/listinfo/development
