The slowest computer Apple sell's has 1.25Ghz (1.2Ghz since last October) and anybody who runs OS X with less than 1GB is a terrible cheapskate (or on a really tigtht budget), so it is not a lot of computer. If you want your Mac to last 3+ years and still run most new programs fine, you have the most high-end version, it has always been like this, I am sorry.
And to 'just run a photo album' which has to handle hundreds of MB while you scroll (thousands of photos at an uncompressed size, and yes to display them they have to be decompressed, of 100 to 200kB) you unfortunately need some processing power, memory and/or a fast harddrive.