By about an inch…and you are moving your body around a lot when descending so does it matter?
To an extent, I think. The wheelbase and top tubes on bikes tend to vary by 1 inch per frame size and when I’ve ridden bikes that are smaller than my own bikes the extra manoeuvrability is quite noticeable, as is the extra unpleasantness going uphill, even disregarding the reduced saddle height. I find it quite surprising that the difference between a 23″ and a 24″ top tube or a 43″ and a 44″ wheelbase is so noticeable, but it seems to be.
On the other hand, I’m not a frame designer, nor someone who has ridden a great many bikes. This is just my general understanding of things. On the other hand I think I gave the same explanation for short chainstays on a thread some time ago and Cy commented that it was generally correct, so I feel that it won’t be too inaccurate. 🙂