Sharing my own experience, I had the same story with the first Witcher game. My PC was a little lower than the specs required, but the only thing bothering me were long loadings (which were fixed in the patches as I was told, I owned one of the first copies ever made, but I finished the game on a new PC already). The game itself runned pretty ok.
So maybe you should try it first on your laptop.
Not pretending to be a father of truth here though. Just sharing experience.