We should test and track the startup time of a (few) typical Qt applications (eg. Widgets and Quick), starting from cold cache to fully initialized and ready to be interacted with. And from warm cache.

By tracking the development of the startup times of typical Qt applications, various regressions can be found, like new overhead by elements added to initialization, larger binaries causing more up-front work when starting from a cold cache, or simply performance bugs that hold up the startup of the application.