I don't think this is a problem with IE, but with the computers, for the same reason as why Chrome is slow.
Public computers tend to have only the bare minumum amount of RAM memory; which makes the computer running at nearly the best of its ability just to keep IE open, this means that typing fast (on any browser or program, word will have the same problem) will be too fast for the computer.
I am also a fast typer, and i see no difference in "comprehension" between the different browsers, when used on the same device (i'm a software tester, so i use 4 different browsers on the same computer regularly)