I did a performance test on my pc to compare the number of poly that 2.83.0 blender can support versus the 2.91 Alpha before crashing. It’s incredible :
I subdivided the monkey head to get 2,048,000 faces (edit mode). I then duplicated it (Shift + D) over and over again in object mode. Result: the polygon number is multiplied by 2,2.
If other people have other tests (similar or different, do not hesitate to communicate them).
My config :
Ryzen 9 3950x - Rtx 2070s - 64Go ram 2133 hrz
The developers are doing an amazing job!