Been playing docked and haven't experienced the reported lag either. (Then again, I've slowed down at Kasandora after a friend accidentally wrote over my save data, requiring me to spend the rest of the day getting back there...)
So glad to hear about the positive sales numbers! This remake was full of heart and soul. (And ugh, Koshiro's tweet about Quintet is so gorgeous and sad all at once!) Whether this leads to more Quintet remakes (would love to re-experience my personal favorite Soul Blazer and the rest of the trilogy this way) or just more intelligent and respectful remakes in general, I'll be happy!
...Though it would also be somewhat interesting to see an Actraiser 2 with the scrapped/non-existent sim sections restored. I never bothered to play it myself once I heard about what they did, but a quick look at some gameplay videos touring the map, it does make me wish you could see and develop these locations like in the original. And given how the new character writing for Renaissance flows into the original game quite well, I expect this team could write civilization plots for 2 that feel like genuine Actraiser.