why not 'je suis vite'?
"vite" is not an adjective but an adverb.
i'm sorry, i'm not expert, but in wordrefereces
vite id an adjective too
I know, but it is ugly French (why change an adverb into an adjective, when you have an available adjective?)
Why do you say that? http://fr.wiktionary.org/wiki/vite says it is, which is taken from Dictionnaire de l’Académie française, huitième édition, 1932-1935
We don't use it any more in modern French, we use "rapide", which is a true adjective.
I think a language that doesn't 'grow', dies. Am I right if I say Le français vivant?
That seems like more of a statement about awkwardness than correctness.
So I decided to ask a couple French folks at work and they confirmed that they see "vite" as an adverbe and not an adjective. They consider it incorrect, as you mention.
GOTTA GO FAST
J'ai la vitesse. ??
Only if you mean "I have speed, you have endurance" (J'ai la vitesse, tu as l'endurance).