I'm a big fan of discovering sentences that can be rapped very quickly.  For example, "gotta read a little bit of Wikipedia" or "don't wanna wind up in the gutter with a bottle of malt." (George Watsky) 
I wanted to write a program in Python that would enable me to find words (or combinations of words) that can be articulated such that it sounds very fast when spoken.  
I initially thought that words that had a high syllable to letter ratio would be the best, but upon writing a Python program to do find those words, I retrieved only very simple words that didn't really sound fast (e.g. "iowa").  
So I'm at a loss at what actually makes words sound fast.  Is it the morpheme to letter ratio?  Is it the number of alternating vowel-consonant pairs?  
How would you guys go about devising a python program to resolve this problem?
I would say it's a good idea to start by taking the examples you gave or other ones you like and doing some sort of analysis for all your ideas on them: e.g. phoneme to to letter ratio, etc; whatever sounds reasonable and that you can calculate. The more samples the better. Hopefully this will give you a good idea of what properties the lines and words you already enjoy share, which should lead you in the right direction.
Otherwise, my laymen's guess is that short vowels (obviously) and hard consonants like 't', some 'p's, hard 'g's, etc, will be best - they make the lines sound staccato and rapid-fire.
(wanted to leave this as a comment cause it's not really an answer, but it's too long :)
Find words and combinations of words that can be spoken the quickest