Redux, switching from program to off takes a lot of time in cantabile VST Host

Everytime I switch from program to off (see screenshot) , redux becomes responsive for a couple of seconds ( luckily no audio drop outs ) and then presents me with a 'instrument was succesfully saved 'mesage ?


Hmm running redux inside renoise does not exhibit this issue >
Only hapening in cantabile ( vst host ) , will contact cantabile developer