fxaa is a lot of faster now because it completely skip search loop, unuseful anyway due to the way we always use it.
several new scalers has been ported to the code, but has been disabled till a decision will be made on what to enable and how
flick_and_noise pass has been completely removed; its code has been merged into the fxaa pass; flickering is not 100% as before, since it will mix not antialiased content over antialiased one, but I'm sure nobody will notice it, since it is a subtle effect and i think not many users like it, probably due to frame inconsistences with hi-res cores.
1.5fps boost is observed on my haswell due to the shader having a pass left; however that gain will be absorbed by the implementation of the runtime choice between different scalers, we'll see.