Performance increase probably won;t be as much as you expect.
Depending on rom and optimizations, while faster, you have to remember, the Optimus V is older and was very highly tuned by developers. It was greater than the sum of it's parts.
Don't get me wrong, the One V is a nice phone and worthy upgrade, but, while you are making a jump in performance, development lags far behind the OV, which narrows that gap.