Hello Alex,
If you’re still interested, you could try the code. It is available here : https://github.com/kermorgant/xibo-slideshow
As Dan stated in the mentioned thread Slideshow module feasibility?, rendering a slideshow through browser based rendering might cause memory issues, but you have experienced that by yourself it seems 
So following his advices, the slideshow module restricts to 10 images max (which could as a precaution be scaled to the region). It also uses progressive loading.
It really lacks testing so I’d be happy to hear how it works for you.