There is a splash screen option [coming soon](https://github.com/pyinstaller/pyinstaller/pull/4887) - you can test it now if you want. To actually speed up initialisation from a onefile archive, the only thing you can really do is squeeze your package as small as possible so that there is less to extract. We also have plans for an installable package option which would be like a onefile app but it will unpack into your program files and stay there rather than a temporary directory. This would mean you'd only need to wait the 1st time you run it. But I don't think anyone has even started on that...
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