Short answer: no.
SketchUp relies heavily on your CPU but it is a single-threaded application that doesn’t benefit from multiple processor cores.
Creating multithreaded 3D modelling applications has been discussed since the first dual processor Pentium machines arrived nearly twenty years ago. I was laughed at by a couple of high-end graphics workstation vendors when I expressed an optimistic view that developers might crack this nut in the not so far away future.
Anssi