The "
Careless" has one of the highest power to weight ratios of any civilian aircraft.
They make a 320 feel like a slug hence the high fuel consumption/relative inefficiencies.
It was known for being one of the fastest flying a/c out there, as well as t/o / rotate, being a blast.
I always looked forward to flying one, because it felt like a mad howling dragster.
Just see how they flew Alrosa flight 514 back out of that short disused military a/f in the Taiga, then it was flying again in 2015
https://www.youtube.com/watch?v=2XUgKLIG_5M
The likelihood of it being overweight is about zero here, so the finger surely has to be pointed to some sort of nasty error >stall scenario.