I don't recall Cython's default optimization level, but you may be able to decrease compilation time by adding a -O0 flag for debug builds. This StackOverflow q

I don't recall Cython's default optimization level, but you may be able to decrease compilation time by adding a -O0 flag for debug builds. This StackOverflow question addresses adding optimization flags to a Cython setup.py script: http://stackoverflow.com/q/16285011/1628916 http://stackoverflow.com/q/16285011/1628916