`speed` is an *extremely* counter-intutitive name here, as the lower this is, the faster it's being typed. I initally thought the default value was too low, so I set it to 10 via `start()` - pretty much nothing happened, I thought it was a bug.

`delay` would be a much better name. Also, the docs here are just plain wrong: `in letters per second`. 0.05 seems like a good default value to me, what do you think?