Storyline 3 Error: Available Memory is Low

I'm on SL360 too and have found that the last couple of updates to the application have improved this situation, at least in my experience.  I'm not seeing the lagginess that I was a few weeks ago.  Interested to hear of others like yourself where you are still seeing the mem error.  I did find that when I stack too much content, like images, in to layers or in to 'states' then performance starts to suffer.  I always optimize images before import to SL to try to lessen the impact of this.  So on the current development I'm building, I'm trying to minimise the use of heavy content in layers.