The C extension wrapping OVS JSON parser is way faster than the pure Python implementation. Right now, this is not getting built and we're using the latter so we would see some performance gain if it could be enabled. There was some attempts in the past [0][1] to get it in but it never made it so I wonder whether it would be possible to enable it by default. [0] https://patchwork.ozlabs.org/patch/699900/ [1] https://patchwork.ozlabs.org/patch/802892/