Need help in a particular flash animation effect

hello everyone.

I am quite new to flash and I am looking for help in a flash effect in which pictures plays as a slide. I created a movie clip but the effect needs a lot of frames to play.

while i found an example in which that effect has been done in just 40-45 frames. it is warner wong architects website. link is i decompiled the .swf file to .fla using sothink swf decompiler. the .fla file link is i wanted to learn how it can be managed in such a low fame count. has it something to do with nesting or anything like that.

expert people kindly put your precious time if you can manage and teach me… thanks in advance.