Er… not sure the firmware security lunacy relates to Bambu Studio being used offline though …
What sorts of features are you referring to though as not working? And generally unresponsive/slowed down or is it specific things that are slow? As it sounds odd that Bambu Studio itself would require internet just to perform slicing tasks… Sending to the printer, sure, that slows down as you are sending directly to the printer, not uploading to the Bambu servers (and it then being downloaded by the printer autonomously).
I just saw this mentioned, ouch