I'm fiddling around with different resolutions and seeing what impact it has on baking/rendering times... The answer is "quite a bit".
This took an hour and a half to bake, and one hour to render on my laptop... The previous 100 resolution clip to 15 minutes to bake and 10 minutes to render...
This is really weird...
Next up, 300!!! Also, specularity increase. I can't get caustics to work cry