load times definitely relate to the number of clips & sequences in your project. You'll probably have noticed by now that the progress bar comes up, loads most of the way, then sits at the 99% point for a chunk of time before it finishes. That last bit is the time where Premiere reconnects to all your media. If there's clips you're not using, definitely consider removing unused media. It'll not only improve your load time, but will also lower memory usage, esp if they're large bitmaps.