Guys not sure if you are aware of this or indeed if anyone else is experiencing it but when I view the new site my CPU usage increases and the fans kick in hard on my machine.
Last night I also experienced major lag when typing - was taking like 5-10 seconds to display every typed character.
I've just checked now by closing and reopening the site and the CPU usage differed by 20%, real memory by 1GB. Obviously these numbers are huge.
What i'm using:
Macbook Pro 2.66 i7
8GB Ram
128GB SSD
NVIDIA GeForce GT 330M 512 MB
OS X 10.8.3
Safari Version 6.0.3
Cheers