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I confirm the patch mentioned above also worked for us, reduced the compilation time of almost empty packages by a factor of almost 5. For the lazy, here is the list of instructions to install it.

sudo apt-get install python-jsonpickle --yes
cd /usr/share/pyshared/rosdep2/ 
sudo rm sources_list.py 
sudo wget https://raw.github.com/ros/rosdep/b0aaeb0fd1e12c6e857d7ebe1785c61f90df5a5a/src/rosdep2/sources_list.py 
rosdep update  
rosmake <package>