Either way it would probably be easier for you to create the textual representation yourself, since it would require plenty of tweaking in order to get the result you want.
Maybe you could create pairs of standard deviations of the current speed and text, like this:
-2: very slow, -1: slow, 0: working fine, 1: fast, 2: very fast
Then plug the rounded stddev of the current speed into the dictionary and insert it into the sentence: "The chat bot is X right now"