Boy, you are right but by setting the size and the dpi to web standard settings (retina @2x) subsequent changes do no result in massive upload sizes. The optimisation is a sort of throttle.
Taking
http://www.hermesaudio.es/index_htm_files/41712@2x.png as a case study.
Xara loads it in at 12MB for 3348x1002px @96dpi.
Its actual file size is 2.5MB. (c.f., PNG vs BMP).
The large difference is how Xara stores images as bitmaps and applies compression after all effects have been applied.
I fitted it to 1440px and
published, with Retina, giving 2880x860 @192dpi and a file size of 177kB.
Without Retina, it is 1440x430 @96dpi and 50kB.
If you Optimise the same 1440px wide image the Bitmap galley image reduces from 3348px wide to 1440px; its (Xara) file size is 2,418kB.
Saved locally it is 573kB.
It is still the 177kB/50kB file that is published but the Xara design is considerably smaller and therefore manageable.
In the OP's case the
41712@2x.png is a whopping 2.5MB, 13 or 50 times larger than necessary.
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