> Python version is super laggy, something to do with OpenCV
Most probably I'm wrong, but I wonder if it has anything to do with all the text being written to stdout. In the odd chance that it happens on the same thread, it might be blocking.
Hmm, I couldn't remember if I tried it without the text being written to stdout. But that's an interesting point, I just didn't expect the print() blocking to be significant.
Could it then be resolved by using the no-gil version of python they just released?