When user is working in assembly environment, by default, and activates one part the complete assembly turns to grey, and with transparency. There is an option to remove this effect.
But as user I see a lot of advantages of having this, much easier to see what part or subassembly is active, but at the same time, the graphic cards, has a lot more to process. So I suggest to have an option to turn all of the other non active parts/assemblies as grey, and non transparent.
I know that there is a config option to turn off transparency:
But with this, user is unable to use transparencies in models.