Hi Rachael !
Actually, it's not that the keyboard is slow. Keyboard is normal. But the display of the text is slow, because of the screen being refreshed every second or so.
If you need to see what you write and if you make a lot of typing mistakes, don't bother getting an usb keyboard on your iLiad, you'll find it very annoying.
I used to have a very old laptop, and I was typing too fast for it. It displayed the sentences two by two, and meanwhile, displayed the "wait" cursor. Horrible. At that time, I needed to see what I was seeing. Now it's different, and I plan to use the iLiad mostly to type things that I have already written on paper.
I was lucky and somebody lent me an usb keyboard. Was in your situation : no usb keyboard and didn't want to buy one without having tried it.
Now I've tried it, it's fine, but as long as I can't get the QWERTZ swiss french layout mapped on my iLiad, I won't be buying any USB keyboard.
I hope somebody will come and give some advice about the mapping of the keyboard