пустая сцена в 2014 весит 19 мб ---- решение
Your problem lies in the Animlayers Control Manager:
it has a huge collection of various weight tracks and animation layers, dont know where the come from
(getproperty trackviewnodes.Anim_Layer_Control_Manager.controller #animlayers).count
report 80 anim layers
to get rid of them, simply set the count to 0 and save the file, result: a 244KB file instead of 80 Megs
(getproperty trackviewnodes.Anim_Layer_Control_Manager.controller #animlayers).count=0