Are you talking about starting application in general or the one you are testing?
In general some time needs to pass for Qt to be ready but the are ways to speed things up ,like loading qml objects on demand.
It is very use case specific how you can improve the situation, so you would have to narrow your issue a little more.
Are you talking about the Felgo splash screen on startup? This is part of our free license, you can remove it and optionally provide your own by upgrading to our Indie subscription. You can find more information on our pricing page.