To improve application startup time, the QML engine needs to allow the compiled version of the QML code to be cached between runs. i.e. caching of .qml files in a fast, mmap()'able binary format on disk.

This should be a cache of the post-compile stage data, in a form that requires minimal tweaking after mmap()'ing so that the memory can be efficiently shared between different processes. This will require a rework of the QML internals to generate data in an appropriate format.