Qt 6.11 is out! See what's new in the release
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QT Creator 3.3.0 / QT 5.4.0 on Win7 Pro 64 bit Very slow start up.
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I just downloaded the QT package and ran QT Creator last evening. It was dead slow to start. There was no change. A web search shows this to be a persistent problem over more than 4 years. The "solved" issues seem to work on Linux systems and not on Windows, so I don't hold out much hope. Unless you have a good and immediate solution to this, I will abandon QT - quite sadly I might add.
Note that I'm running with 4GB of memory on a dual core AMD processor.
Good luck.