How about to create the loading screens with tooltips? (while loading the map)
Here is what i thought about it:
One for each alien, one for each marine weapon/equipment or two weapon for each screen, one for marine commander, one for alien commander, one for the alien evolutions (carapace,silence,...), one for resources/power nodes, one for basic alien structures, one for advanced alien structures, one for basic marines structures, one for advanced marines structures
Each screen must have the basic information and maybe advanced information
And the zoom in effect while loading must be turned off...
just a quick example: