Google is your friend steelboy (or DuckDuckGo if google is not your friend) ...
https://en.bitcoin.it/wiki/Vanitygen answers both your questions (yes and yes, plus the speeds) and provides links.
Good luck, and be careful with those private keys, they are generated in plaintext so be sure your Mac is clean, and you'll need to import them into a wallet before you can use them.
I did check that page but it's pretty complicated. I went to the github page and downloaded the zip file. The folder is full of files with crazy extensions. Very confused.