On my first patrol while also the first time I've tried this mod during campaign and no CTD or slowdowns that I've experienced after 2-3 hrs of gameplay. Now the other news is that I detected a large group of ships while under the night skies and began my stalking while surfaced and dropping every now and then to get new bearings. Soon I was right on top of them and could see no ships and thought ok my first bug. But while scanning with the scope I saw the surface of the water break and took a look with external cam and lol I'd been chasing damn dolphins the whole time.
My first encounter with them and while eager to go find a ship my daughter had to chase them around for a good 30min using the cam. She was pretending like she was one of them swimming with the pack.