Seeking tips to faster 8.0.1 project loading

I recently upgraded to 8.0.1 and my projects take a very long time to load while files are scanned.   IDEA seems to cache information about the latest project and loads that quickly, but I switch between a number of development source code branches of a large project; whenever I switch, it seems to incur a wait of several minutes.  One factor that might be influencing IDEA is that the project has the same name in each branch.

I don't remember having to wait this long with 7.0.x.

Are there any options I can tweak to encourage IDEA to cache more (more space or more projects)  to avoid the long wait while loading projects?