Massive framerate drops in Editor, after importing packages or adding objects.

Hi,
I am getting massive framerate drops in the editor whenever i change something to a scene like adding items. Or importing packages to the project.
It can be fixed by going to edit --> gfx emulation and then selecting a different emulator, doesn't really matter which one and just switching back and forth between them when it happens. Restarting unity does not work.

But is there a better solution?

I am using a mac pro with mac os and the dual d700.