I stripped off the HP-calculation of the Karlsen filter abstraction and got ca.35% CPU Saving.!
Only used the clipping -1 +1 , no tanh calculation

27% with 8xOS
Bildschirmfoto 2020-12-27 um 18.46.04.png

21% with 8xOS without HP-calc
Bildschirmfoto 2020-12-27 um 18.47.00.png

My PD uses 7% in neutral mode(not running an abstraction)
Bildschirmfoto 2020-12-27 um 17.30.58.png

It would be more elegant to use a switch in the HP pd... but nevertheless for your moog you need only the LP-part of the Karlsen Filter?!
karlsen-ladder-24-LPonly 3.pd