Even though my simulator is running smooth again after rolling back to v2.2. My thought is still haunted by the mysterious cause and reluctantly to let it go.
After carrying out various deep cleanings on my computer and reinstalled a clean upgrade from a new download onto the same but reformatted SSD, eventually, the P3D v2.3 is up and running now. Very likely that there were somethings missing in the first download or the stutters were caused by some unknown leftovers from the last version.
Well, there are still significant stutters encountered over certain areas sporadically. But in general, the v2.3 upgrade is so far performing as it should be.
For the moment, it’s premature to say that the new version is better or worse than the previous one since nothing has been added to it yet.
Will update more after system is properly tuned.
For the moment, don’t miss the feedbacks in the Comment section.