In-editor compile times

Hi.
I recently upgraded my computer from a CPU of 4 core i5, to a 6 core, hyperthreaded i7 (6800K).
I noticed that when I compile the entire engine in Visual Studio, the compile time has been drastically reduced, going from over an hour to a mere 15 minutes.
However, when I try to compile my changes in the editor, the compile times are exactly the same.
I also noticed that when I compile in editor, only two logical cores are engaged.
I tried adding the following lines to

UnrealEngine\Engine\Saved\UnrealBuildTool\BuildConfiguration.xml

		<ProcessorCountMultiplier>1</ProcessorCountMultiplier>
		<MaxProcessorCount>2147483647</MaxProcessorCount>

and modifying the ProcessorCountMultiplier to 2, but it doesn’t help.
Also, the MaxProcessorCount is already set to some crazy number, yet I only see two logical cores engaged in windows performance monitor.
I also disabled indexing for the entire folder of my project.

Any ideas as to how to get better compile speeds?

just use SSD

I do. I have an SSD only computer.