The shape builder tool takes 4 minutes to finish deleting shapes (when hit alt to get the minus sign and subtract shapes from a selection). It takes up so much power from my CPU that my task manager says illustrator is taking up 100%. Deleting the inner parts of a font (D, R, P) took 2 hours last night when making a logo. I restarted my computer 8 times, started a new illustrator file 4 times (thinking it was a corrupt file) and eventually just waited out the extrodinary processing times to get my project done. It's really ridiculous.