jsiegl71: Divinity 2 original Sin2 - Definitive Edition: framerate drops to 0 every 5-10 seconds
Worked fine before the 'upgrade' to Definitive Edition. Game is not playable anymore as every 5-10 the game starts to stutter, frames drop to 0 until it recovers and runs smooth after another 5s...until it stutters again.
I've seen plenty of other forums complaining about this.
You mentioned "forums" but you may not be aware of GOG's game specific forums:
gog.com/forum > search game series or game title in bottom left bar, like "divin" in this case. You may want to search that forum, or you can try asking Support
but since it's a new game, fixing the problem may up to the devs, not GOG.