Aperture Loading Assets - Can it be quicker?

Hi, I've loaded in several hundred RAW images from my Nikon DSLR into Aperture 3.2 and the other day I took only a few more images then wanted to import them but had to wait for aaages for Aperture to load the assets into my import screen, is there a way I can set Aperture to show only un-imported images like in iPhoto? I don't want to see several hundred images loading when I only need to import the very last few

Many thanks

 

Cool, will try that next time to see if it works. Thanks

 

Just tried it, unfortunately the 'don't import duplicates' box is greyed out when I go to import some photos

I still have to sit through about 700 photos loading in the viewer just to import the last few