Trials are lead DirectX games, there s no issue with the X1 API. Actually the game is better build for the X1 than it is to PS4 api (GNM) or via the wraper wich convert DX code, but implies a lot of overhead. It's gonna be this way all the generation, maybe even worse with time when people roll up their sleeves and go down on the GNMX-ASM stuff on PS4.
You can't expect to make the same game with less CU, less bandwidth and less ROPs, thoses are the 3 pillar components for rendering performance (render-move-rasterize), it's physically impossible, even on that kind of game (heavier than most people think)







