Startup 6.9.1 A LOT Slower than 6.8.1

[Dariusz]

Hello

I've recently migrated to 6.9.1 ver and I noticed that my apps starts A LOT slower, I'm talking about 60-80 second start up in debug mode comparing to 5-15, which is quite... massive...

Is this release bugged/should I do something ? Any1 else experiencing this issue?
Thanks!

[JKSH]

@Dariusz said in Startup 6.9.1 A LOT Slower than 6.8.1:

my apps starts A LOT slower, I'm talking about 60-80 second start up in debug mode comparing to 5-15

That sounds very abnormal. I haven't seen anything like this myself, but if you can simplify your project into a reproducer, please create a bug report at https://bugreports.qt.io/secure/Dashboard.jspa, attach your reproducer, and add [Reg 6.8.1 -> 6.9.1] to your report title to highlight that it is a recent regression.

[Dariusz]

Hey
I've had a bit of time to start digging in to it a bit more.
My slowdowns seems to come from here :

        inline void registerImage(const keyType&key, const QImage&img) { mImageCache[key] = img; };

        inline void registerPixmap(const keyType&key, const keyType&imagePath) { mPixmapCache[key] = QPixmap(imagePath); };

        inline void registerPixmap(const keyType&key, const QPixmap&img) { mPixmapCache[key] = img; };

        inline void registerIcon(const keyType&key, const keyType&imagePath) { mIconCache[key] = QIcon(imagePath); };

        inline void registerIcon(const keyType&key, const QIcon&img) { mIconCache[key] = img; };

        /*!
         * Register input as all types of images & convert for each.
         * @param key
         * @param data
         */
        inline void registerAll(const keyType&key, const keyType&data) {
            registerImage(key, data);
            registerPixmap(key, data);
            registerIcon(key, data);
            mRegisteredPaths[key] = data;
        }

keyType = QString/char*/etc
the path I'm providing here is from QRC compiled svg icons.

I remember reading that qt was getting new SVG engine, and this is VERY slow now, my app startup went from instant to 20-30 seconds.

I'm still drilling down what is exactly causing it, but do we have any reports of svg/pixmap/qimage issues?

Appear to be this:
https://qt-project.atlassian.net/browse/QTBUG-139060
seems like 6.10.1 does not have any fix yet... :-(

[JKSH]

@Dariusz said in Startup 6.9.1 A LOT Slower than 6.8.1:

Appear to be this:
https://qt-project.atlassian.net/browse/QTBUG-139060
seems like 6.10.1 does not have any fix yet... :-(

I just tried the test code + image from QTBUG-139060 using Release builds with MinGW:

Qt version	Load time (s)
6.7.3	6
6.9.2	93
6.10.2	7

So, that particular issue looks fixed to me.

If you're still seeing significantly slower loads in Qt 6.10 compared to Qt 6.7, please create a new bug report with a minimal reproducer.

[Dariusz]

@JKSH Hmm I just installled 6.10.2 and the app still takes ages to load on svg's.
Perhaps its the combination of the particular file format I have + loading from qrc :/
Will investigate more.

[Shummi Claire]

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