Influência da velocidade do processador no processamento da imagem

That's utterly moot on both accounts. PS does use a bunch of GPU functions, but it never even comes close to fully exploiting your GPU in the first place. Hence any upgrades on that front won't yield any performance improvements, including a new CPU. Similarly, the strictly CPU-based functions are limited by other factors like data transfer rates of your storage, memory and PC bus, how well they are parallelized, what other apps and services are running on your computer at any given time and so on. In your given example therefore the effective improvement will either be zero or something like three percent and you may not even benefit from any of it unless you really work on extremely large or complex documents that really tax your computer. Again, there is simply more to this than saying faster processor = faster working. And of course this would matter even less, since you already have pretty good hardware.

Mylenium