Hello everyone! I have a problem with Xcode. I installed Snow Leopard 10.6.8 and it works very well, unfortunately when i install Xcode 4, the computer slows down excessively. if I cancel everything, everything returns to normal. Obviously startup is slow and putting in verbose mode I noticed that hangs at the beginning "EBIOS read error" and after a couple of mistakes, come on. what do you think could be the problem? has already happened to someone? I found the same slow installing iLife '11, and I fixed by installing the version of the '09. Thank you all!