Gentoo Portage makes it fairly easy to update all the installed packages on your system. The emerge and revdep-rebuild tools are powerful and make the process of recompiling everything much less painful than it sounds.
The emerge and revdep-rebuild commands require root privileges so switch to root or use sudo.
The first step is to synchronize your [...]

By default when you emerge a long list of packages in Gentoo you have to download each package completely before the build process can begin. This can be a large bottleneck, especially if your internet connection is not very fast.
Luckily Portage has a great solution.
Go to the file /etc/make.conf and add “parallel-fetch” to the [...]