A leaked benchmark has appeared claiming to be from a 2018 iPhone model, providing some possible insight into what kind of performance gains we’ll see this year. Shared by iGeneration (via MacRumors), the results show a single-core score of 4673 and a multi-core score of 10912, suggesting the new A12 CPU in this year’s models will outperform the 2017 A11 by about 10 percent. The Compute score for the 2018 model iPhone also shows a higher…