Disable rosetta in snow leopard

If your Mac OS X Snow Leopard 10.6 have already been installed Rosetta, you can disable it via Terminal for higher performance and to prevent the system from running PowerPC apps

First, open the Terminal. Open Applications -> Utilities -> Terminal. Then type the following command from terminal and hit enter.

sudo sysctl -w kern.exec.archhandler.powerpc=/usr/libexec/oah/RosettaNonGrata

To re-enable it, try these commands:

sudo sysctl -w kern.exec.archhandler.powerpc=/usr/libexec/oah/translate