This thread is dedicated to useful tips on running an Arch install.
CCACHE To Help Speed Up Compilation Process When Installing Packages From AUR
You need to install ccache package first. For those wondering, ccache is a fast c/c++ compiler which is used to speed up the compilation process. It speeds up recompilation by caching previous compilations and detecting when the same compilation is being done again. It supports C, C++, Objective-C and Objective-C++.