Startup time of desktop application (ensureStaticOpenGLContext?)

[tgru]

We have a desktop application on Windows 7.
Qt 4.8.: double click on icon --> application starts immediately (customers noticed with some kind of wow!)
Qt 5.4.: double click on icon --> ... application starts a little later (less than half a second but not immediately)

So it is ok, but not really wow! Profiling around there is a call to

QWindowsIntegrationPrivate::ensureStaticOpenGLContext()

At this time we do not have an OpenGL window. This will start only after user input. Then half a second is ok.

1. Is it true that there is a OpenGL create command even if no OpenGL is used at start time
2. How do I get back the quick start wow! ?

Thanks!
Thomas