I would definitely like an option to set the screen's resolution, and I would also like an option to go into true full-screen mode. Currently node WebKit uses a borderless window that's set to the size of the screen. True full-screen mode generally has better performance.
Part of the problem with low-end laptops, as far as I understand it, is the lack of proper OpenGL support. If the computer doesn't properly support OpenGL, then it uses something that I think is called ANGLE that translates the OpenGL calls to directx, but incurs a performance hit. If it can't do that either, then it falls back to software rendering, which obviously incurs a performance hit as well.