No problem whatsoever! :) It's not any kind of carelessness from your behalf! I'm tempted to actually turn the VSync off as default, as it is noticeable to someone who has a monitor needing VSync that they should turn it ON, whereas someone who doesn't need it may feel it is a performance issue, like in your case! :) That's alright, thank you very very much. And, btw, which puzzle/mini-game part? :)
I also added an option on the Graphics Settings that allows for the people to turn the dialogue showing effect OFF for something much simpler, as it is the first place where, with low performance, it's highly noticeable, leading to that issue you talked about, where the voice acting finishes much earlier then the actual dialogue showing :)
No worries about the resolution, you've been a great GREAT help! :D Hope the weekend's going well! :)