UE 4.17: Source compiling insanely slow on adding a plugin to the project

I have been playing with Unreal Engine source for a while. I built Unreal engine 4.17 from the source. After adding a Plugin to the project, the compilation time has become insanely high. Any changes I make in the plugin would require me to build the project again. But this is frustrating as I cant add rapidly make changes to my code resulting in very slow development cycle.

How can I improve my compilation speeds for building plugins?
Thanks