its Capt Bloggs with his eye on a cute trolly dolly and wanting to get a slot as quick as he can
Arr, the impossible dreams...
Slow makes me money (and is quieter) but I'm a closet leadfoot at heart!
CB, .71 > .73 is only 11kt TAS at FL350ish.
Chinese fella,
Lots of variables will attempt to put the aircraft off the FMS VNAV profile, causing the autothrottle (or driver) to react to correct the speed. Might have been wind, a reduction in Vert Speed for traffic management, a quick squirt of anti-ice...