I haven't watched the GCN video referenced in the preceding post, since they are a bit scientifically-challenged.
I will agree with DrIsotope, two posts earlier: while you might gain some performance and speed by upgrading other components (seems like you've got some old and cheap drivetrain bits on your bike), you'll likely gain nothing with a new frame. In fact, your Moulton frame might very well be made of air-hardened and heat-treated steel, as that was available twenty years ago...And you won't find a current steel frame made of anything better than that.