I'll concede an order of magnitude for dds, I may not have been using it optimally. The claims made by Lorand Dali for his neural net solver were a thousand times faster with a slight drop in accuracy (99.9%+ I think)
I believe this was used in his 'ben' bridge engine, https://github.com/lorserker/ben/ now maintained by ThorvaldAagaard, though I have to admit it now seems to be heavily dds focussed, so there may have been a rollback along the lines you outlined.
I'm attempting to recreate the concept myself, so should soon have an idea whether its moonshine or not,
I believe this was used in his 'ben' bridge engine, https://github.com/lorserker/ben/ now maintained by ThorvaldAagaard, though I have to admit it now seems to be heavily dds focussed, so there may have been a rollback along the lines you outlined.
I'm attempting to recreate the concept myself, so should soon have an idea whether its moonshine or not,