So I posted about this in the Abyss thread because I was sure it was an Abyss issue, but when in areas like Rano, Connous and Courcle, areas with large maps, the map scrolling while moving will cause heavy stutters of a half-second or more. Zooming out somewhat alleviates the issue, the stutters will occur more gradually. Fully zooming out the map, enough for there to be no zooming, still causes occasional stutters.
I tested some things via the Rano map. Extracting and injecting the UNALTERED map via abyss resulted in what felt like simple dropped frames, almost like the display quests bug. Injecting the modded map into the original .it file results in the same issue as trying to inject the data folder via Abyss. This also occurs with Kanan. Theres not really any issues with the smaller map mods like the shadow mission maps.
I am all out of ideas. The game just hates something about these modded map files. I have even tried reinstalling Mabinogi, with no change in behavior. I AM using the Steam version, but I can't imagine it would change anything.