When developing FreeCAD one needs to build from source and the compiling/build phase can start eating in to precious development time. Here are some tips to shorten that process and make build times more efficient.
Install ccache to cache builds
Use cmake-curses-gui, cmake-qt-gui, or cmake flags to disable modules you aren't working on
Use make -j # to specify the number of jobs. A suggested value is your number of computer cores, e.g.
make -j $(nproc)
Distcc can be used for distributed compilation on a network.