Lighting issues

So I'm working on a scene right now, and out of the blue, issues have been popping left and right.

First and foremost is my framerate after a lighting build. It just seems to drop. If I just toggle the light and "unbuild" the scene, my framerate doubles, not to mention it even looks better for some reason.

I'm getting extremely sharp shadows with a Stationary light, but the lighting quality is much better than a movable or static light. I need that indirect lighting that Stationary lights offer, but with soft shadows. I don't recall this being a problem earlier today when I was working on my environment, I would have noticed the ugly shadows. Perhaps I accidentally unchecked something?
In fact, the preview shadows look significantly better, so what gives?

Here is an example of what I mean:
The Good: Unbuilt Lighting


The Bad: Built Lighting



Thanks in advance!