Hi, I have the late 2011 MBP 17" with 4GB RAM. I use parallels (will be switching to boot-camp), xcode, eclipse, iPhoto in my daily life. What kind of effect would the new installation make on the system performance if I install Mountain Lion (faster, slower or same?) ? And I would like to install it as a totally new installation instead of upgrading from Lion to Mountain Lion. Whats the best way to completely erase my MBP and install the new OS ? Regards, MacMan988.