Faster builds?

I am having trouble with the time it takes to build even the project code, which usually runs into 5-10 seconds or more, and this is without a memory usage that pushes my PC (4GB RAM) too much, in a new Third Person Template project:

Shaders also took ages to build- I switched to OpenGL in the Project Settings which mostly solved this.

The thing with my motherboard is it only supports 4GB RAM. However, that doesn’t stop me developing fast in CryEngine or anything else. It takes me 29 minutes to build the Unreal engine from source. What are the expected build times for Unreal 4.3, on a quad core PC?

I was wondering if I could strip out the more unessential stuff, or simply add a c++ interpreter rather than building a DLL, because then code doesn’t need to be compiled at all. Is there anything else I could do? Maybe I’ll just buy a new PC with more RAM anyway.