An AEG or BASR can only impart the volume of air available within the cylinder at the expansion/power rate of the spring pushing the piston. For the most part this push is also fairly constant.   With a GAS setup you have an infinite 'volume of air', and the volume required also adjusts itself automatically (via the floating valve) to whatever weight BB is being fired, its like re setting your cylinder to barrel ratio every time you shoot.   Where does the extra energy come f