Wow! The Developer Beta on El Capitan is insane! I got to play on a base model MacBook for about an hour and the UI transitions and swiping was seamless and buttery smooth. Also, keeping the transparency on or off as well as a scaled resolution of 1400 X 900 didn't seem to affect the performance either. I'm very impressed with El Capitan so far and I can't wait until the final version is released to the public! I'm very tempted to download the beta on my little MacBook now. I understand what Alex King was feeling now!