Chris Richards at Washington Post on South Florida "fast remixes":
"Clock-torquing has always been central to rap music, with DJs and producers perpetually tweaking the speeds of their samples, treating time like gobs of Silly Putty. Houston’s DJ Screw changed the trajectory of rap by famously slowing records down, loosening the tempo until it melted into a beautiful ooze — so it makes sense that a fast remix does something like the opposite. Instead of liquefying, the details crystallize. The beats become light and delicate. The rhymes get tight and Smurfy. Give a fast remix your most undivided attention and it’ll start to sound like a double-refusal of temporality and corporeality — a sort of metaphysical protest music."
although hearing them I think he kind of oversells a bit...
Some examples he cites: