The program start slowly with repaint problem

[SABROG]

In attach you may view empty window when programm starting, after few second his redraw normal.

I fix this by add this in constructor and remove show() from main.cpp:

QMetaObject::invokeMethod(this, "show", Qt::QueuedConnection);

QMetaObject::invokeMethod(this, "show", Qt::QueuedConnection);

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In mainwindow consturctor i create 2 instances QHttp my be in this problem?