Python syntax time functions in cas

[parisse]

monotonic is not available on the Prime (if you type monotonic on the commandline it is returned as an identifier, not as a commandname), the firmware is too old compared to the current source code of Giac (this is also unfortunately true for some Python-like syntaxic constructions).
You can run time(...) to get timings. A shortcut is to write your command followed by the Sto key and the , key, that's probably the easiest way to do benchmarking.