In Version 4 of Simplify3D the publishers introduced a couple of changes that they claim reduce print times when using rafts and, additionally, make it easier to separate the raft from the part.
In this video I look through what has changed from Version 3, regarding rafts, and run some test prints on both versions to see the improvements. I was surprised!!
If you want to download the part that I used for the tests, which as far as I can tell is the same part Simplify3D show on their website to highlight print time improvements, you can get it here!