Is fast (repeated) undo possible in emacs?

Question

I use emacs and I have a problem with it\'s undo.

(Sorry, maybe this is a stupid question, but I did not find anything about it in the internet, whilst it should be

Answer 1

Hold down Alt, type 2 0 0, then press CTRL+x u.

This gives an argument of 200 to the operation you are going to perform next (e.g. undo), so it applies that operation 200 times.

By the way, CTRL+/ is also mapped to "undo", if you would like to use fewer keystrokes.