With our current knowledge, the girl is believed to be faster than the boy. The advantage of the girl is roughly estimated to be in the low single digit seconds; as of 6 Nov 2016, the consensus estimate is a 120 frame (~2.01 second) advantage for the girl.	



[1] Known girl advantages: ~125 frames  (rough estimate)

> The girl's backsprite isn't compressed, so it loads faster than the boy's. The time save is apparently 1 frame per backsprite instance (# of instances = # of trainer battles + # of wild encounters).



[2] Known boy advantages: ~5 frames

> Picking the boy in Crystal saves 5 characters of text in an S.S. Aqua cutscene.


Boy:

  "Grandpa, here I"
  "am! I was playing"
  "with the CAPTAIN"
  "and this guy!"


Girl:

  "Grandpa, here I"
  "am! I was playing"
  "with the CAPTAIN"
  "and this big girl!"