It looks like there were several different issues discussed here.
The ros2 topic issue seems to be a bug in the truncation of the output and printing to console is taking a very long time. This should be addressed by
https://github.com/ros2/ros2cli/pull/126
The issue difference of FPS between C++ and Python that can be addressed by running the python interpreter in optimized mode: setting the environment variable `PYTHONOPTIMIZE=0` or passing `-O` to the python invocation. (related ROS answers post [here](
https://answers.ros.org/question/296715/ros-image-message-rate-is-low/))
HTH,
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