Actually Nikon View does do what you stated above. heh not sure if there is a Canon equivalent. Of course speed of loading a 100% picture is slower than jpgs - you have to load more MBs of data, just like speed of loading a hi res jpg is slower than a low res one. but if you're talking abt viewing thumbnails and a draft version of the image (aka at around 16% of 6mp?) it loads as fast as a jpg and works like ur ACD-See