I wrote a client/server crypto system on Windows. The client was in C, the server code in Python. The Python code took maybe 5% of the time for a similar amount

I wrote a client/server crypto system on Windows. The client was in C, the server code in Python. The Python code took maybe 5% of the time for a similar amount of functionality as in the client. No discernible performance impact from using Python. C was not in of itself a bottleneck in this case, rather the complexity of the Windows crypto API was.