Apologies if this is already doable, just came to mind now 
Ability to automatically grab/resize images that are above a certain filesize and/or on external servers. This will help prevent poorly optimised/overly large images from slowing down page load times.
Option that if image can't be grabbed/resized it is replaced with a default image.
Option that if an image is above filesize X it is replaced with a default image.

Ability to automatically grab/resize images that are above a certain filesize and/or on external servers. This will help prevent poorly optimised/overly large images from slowing down page load times.
Option that if image can't be grabbed/resized it is replaced with a default image.
Option that if an image is above filesize X it is replaced with a default image.
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