Hello,
The way EB handles images is absolutely not inappropriate!
See example:
Orignal Image : 1248 x 1248 238kB
EB thumb 128x128 : 11.21 kB
EB medium 640x640 : 232.42 kB
EB large 960x960 : 494.55 kB
EB amp 1200x1200 : 723.04 kB
EB ??? 960x960 : 494.55 kB
From 1 original file of 238 kB we end up with 5 files and a storage of 1955,77 kB !!
Is this on purpose to sell us your Image Optimization Service ???
That is not acceptable !!