[LAU] Why is Jack so slow?

Friends I have a Raspberry PI with a PI Sound board.  Wanting to use modep (https://blokas.io/modep/) live I have hacked a pedal together and can change settings with it. modep is a gnarly ball of python and tomahawk (sp?) that I do not need so I have stripped down the actions the pedal needs to do to eight Jack operations: disconnect the left and right output  and input, and reconnect them in a different way to affect an effect change. I have written a small rust programme with the jack crate to interface with Jack.  Four disconnects, four connects. It takes over 200ms of system time, optimised rust.  Two hundred milliseconds is a long time. Can anybody tell me why?  Is there a solution? I am hoping to get it down to ten milliseconds. Worik -- If not me then who? If not now then when? If not here then where? So, here I stand, I can do no other root(a)worik.org 021-1680650, (03) 4821804 Aotearoa (New Zealand)