[SatvikBeri]

It was roughly "given this dataset with 100 time series, write code to calculate these statistics as performantly as possible. Make one single-threaded version and one using 4 cores."

The C++ versions were around ~250 lines long, and the developers generally only had time to try one approach. While the Julia versions were around ~80 lines long, and the developers had time to try several approaches. I'm sure the best theoretically possible C++ version is faster than the best Julia version, but given that we're always working with time constraints, the performance per developer hour in Julia tends to be really good in my experience.