Okay, I know we can disable ICC profile embedding, PDF compatibility etc, but none of that even comes remotely close to the "correct" file size of < 10Kb.
C'mon Adobe, what are you putting in that CS5 file that's so darned important? This isn't a complex illustration with gradient masks, 3D transforms and thousands of points.
I get it, everyone has terrabyte drives and high-speed internet. Is that an excuse to make really inefficient file formats?