File size is very important for many reasons including speed and server space.
I noticed a file off 711ko (4000x2815 72dpi) was scaled to 1800px (standard size in global config) and now weights 2,07Mb !!
1Would it be possible to include a service like ReSmush.it or TinyPNG?
PXLCompressor was a free Joomla plugin that is abandoned. Check it here in the Joomla Extension Directory
TinyPNG has a Developer API documentation page.
2Files uploaded in the 'tmp' folder are not deleted and will use a lot of space...
They should be deleted after the resize or at least there should be an option in the global settings to delete them or not.