It performs well IMO. Area around front driver/passenger maintains its structure.
Overall Safety Rating: 5 Stars
Frontal Crash Rating: 5 Stars (Driver: 5, Passenger: 5)
Side Crash Rating: 5 Stars (Driver: 5, Passenger: 5)
Side Pole Crash Rating: 5 Stars
Combined Side Barrier and Pole Rating: (Driver: 5, Passenger: 5)
Rollover Rating: 4 Stars
Risk of Rollover: 18.8%
NHTSA – New Car Assessment Program (NCAP), Frontal Test:
Crash test dummies representing an average-sized adult male and a small-sized adult female are placed in the driver and front passenger seats, respectively, and are secured with seat belts. Vehicles are crashed into a fixed barrier at 35 mph (56.3km/h), which is equivalent to a head-on collision between two similar vehicles each moving at 35 mph.
Frontal Air Bag: Driver, Front Passenger
Curtain: Driver, Front Passenger, Rear Seat
Torso/Pelvis: Driver, Front Passenger
Knee: Driver, Front Passenger
BMW X5 Side Crash Test
And this 2015 BMW X5 | Pole Crash Test: