A Cities: Skylines mod, developed from original code by Thale5.
Customizes the loading screen, offers a number of options to control loading (and what is and isn't loaded), and (most importantly) significantly improves the performance, and reduces the memory footprint, of the game when loading custom assets.
For more detail, and for Steam binaries, see the mod's Steam Workshop page.
Binaries for the Epic Games version of Cities: Skylines are available via the Discord linked on the Steam Workshop page.
Portions of this code are licenced under the MIT licence, but other portions of this code have copyright enucumberances and are not available under the MIT licence. The full code is provided here in the spirit of open-source and can be used for the purposes of private experimentation, but any product based on this code cannot be distributed publicly without further express permission. Please contact me directly for further information if required.