MH 370 Fast Climbing Rate?

Why would this flight reach 35,000 ft so quickly? I am a former flight attendant, and I don’t recall any flight where we reached such altitude in 15 minutes. I can imagine it is possible, but not very comfortable, I bet! Why would the climb be so fast? Anyone? Thanks. Nick.

Not that unusual. Relatively short flight for a 777 so they’re light on fuel and only had 240 pax. Also it took closer to 19 minutes than 15, since we didn’t have any positions in the first minute.

Looks normal.