While KiCad has some known shortcomings when it comes to handling very large designs, it's worth investigating this particular case as I'm not aware of a reason why PcbNew would have slowed down significantly between 5.1 and the current nightlies.
While KiCad has some known shortcomings when it comes to handling very large designs, it's worth investigating this particular case as I'm not aware of a reason why PcbNew would have slowed down significantly between 5.1 and the current nightlies.