CityScene Orlando users...here is a comprehensive support document that will describe several ways you can tweak your system for both load times and performance improvements.
This document also applies to other CityScene regions when it comes to performance and load time suggestions.
Please read this document before asking for support help, as many of the questions should be answered. Of course, if something is not clear, feel free to ask for additional help.
Click the link below to load the 12 page PDF.