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I thought , "vite" was only used as an adverb.
However I can see that it can also be used as an adjective but in an informal way .
I would suppose the pronunciation would be identical. (I am not familiar or comfortable with phonetic forms ,personally)
There is no need to use "vite" as an adjective -you can use "rapide" and I am sure there must be other alternatives.
the adjective form is quite old fashioned, just as Georges rightly said we'd rather use the equivalent "rapide"
Valery est de plus en plus incapable d'écouter autrui, son parler est de plus en plus vite et indistinct
However the pronunciation should be the same: /vit/