Highlight oversized images

This option highlights images that are too large by both inverting their colors
and flipping them vertically:

The highlighted images use more memory than is required;
for example, a large 5MB image displayed at 100 by 100 pixels.

Such images can cause poor performance, especially on lower-end devices
and when you have many images, as in a list view,
this performance hit can add up.
Information about each image is printed in the debug console:

dash.png has a display size of 213×392 but a decode size of 2130×392, which uses an additional 2542KB.

Images are deemed too large if they use at least 128KB more than required.

Fixing images

Wherever possible, the best way to fix this problem is resizing
the image asset file so it’s smaller.