Can you please confirm that you have updated your H90’s software to 1.2.2? This issue was addressed in this update.
Using the 1.2.2 software I cannot reproduce your issue. Programs that use the H910 H949 algorithm do not have a noticeably longer load time when loaded using the pedal’s footswitches or a MIDI controller, and I am never experiencing a gap in the audio.
If you are still experiencing issues once you have updated to the latest software, please let me know if there are any specific Programs you are noticing this issue with. I have tested this with the Factory Programs “Graduation” and “Dream Sequence” along with some other Programs I created.