My sympathies for you… unfortunately I find this software is great for speed and accuracy but unfortunately these benefits come at a price. I reckon you are going to have to kill it and restart.
It’s a bit of a gamble… slow and steady with the competitors software but will more than likely get you an output eventually… or try your luck with the super-fast option which I think pushes your hardware to it’s limits- if you do get an output highly likely it will be amazing but there seems to be a bigger risk of failure… process for hours and hours and come back to the big red error bar or a re-booted computer and back to square one.
I for one would like the ability to be able to dial down the power a bit, at the expense of a bit of time to ensure a more reliable output. One could fine tune to suit their hardware and over time processing many projects you’d have a fair idea of what was going to work on your system successfully or not.