build workspace very slow on Raspberry Pi

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Good afternoon,

When I try to build the workspace using sudo ./src/catkin/bin/catkin_make_isolated --install -DCMAKE_BUILD_TYPE=Release --install-space /opt/ros/indigo -j2 after having added a package, there's always a slowdown and I have to wait hours for it to finish.

I added swap space as said here but nothing changed.

I'm a noob to using ROS and Raspberry Pi. I would like to know the reason why and a solution to this problem.

Thanks in advance