Xcode playground takes way too long to run

I've been running Xcode with no issues, and all of a sudden playground sticks on Running Second, as seen in the image. Occasionally Xcode "stops" responding upon the launch of the project.

This takes forever and it's very hard to get a project going due to the time it takes to get start. Any ideas? I've spent hours trying to figure things out. I'm running Xcode 7 with Swift 2.0