I don't know what camera you have, but if it's a d-link dcs-6xxx, or similar, there's a URL which fetches a single jpeg; it's trivial to make a page that reloads this rather more than 1 fps; about 5-10 on a desktop. Though I haven't actually tried from a tablet, I expect it'll be at least as fast (and quicker to get to) than rdesktop...