Haven't spent much time with it yet, but two things:
1) Writing on the memo is really meant for the stylus. It isn't keeping up with my finger writing characters on the touch screen at all. Also, yeah... menus have some lag associated with them.
2) There is no way to speed up text-scrolling, is there...
Oh, so in the full game, you can totally just swap it from hard to easy if you really wanted to? Can you do this mid-puzzle? Nevermind, read the help section tips on that.
Perhaps I shouldn't have picked the Escape section first, haha. And I'd also like to mention that I'm spending quite a decent amount of time reading the help section. >.>
Edit: Hrm. Perhaps it's better to take screenshots of things you intend to keep in the memo and keep the photo album open to flip through things rather than record it in the memo. Oh, lol... I made a model of one of the chemicals mentioned before. It was pretty great (not really; just big).