The $gettok is necessary for all of the modifications to be accurate.
You're right, however, about having to process multiple if's rather than if/elseif/else being slower.
As to the actual overall speed, it's difficult to say if Korvin's corrected code would be faster or slower than your original code, Aucun50, due to the fact that your code uses multiple ON TEXT events, which, in reality, do a built in if (the event has to check if the matchtext section matches the entry or not).
Additionally, a true speed test would have to be checked between the same two points in the two scripts, which is difficult to do, based on the fact that one uses a single event, and the other multiple events.