What type of problems can you have using AIR 3 on a 1.3GHz processor? The AIR specs have a minimum of 1.6. Specifically: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02557184&tmp_task =prodinfoCategory&cc=us&dlc=en&lc=en&product=4348786
We define the system specifications to ensure that you're going to have a good experience with the product.
For the minimum CPU speed recommendation, this is primarily for performance reasons. You can use AIR on a slower machine, but applications built with AIR might not perform as well as they would on more capable hardware.