For example, imagine uploading a 2000 x 1200 pixel image as a featured image. This relatively high resolution makes sense when placing the image full-width on the top of a post. However, it would be impractical to squeeze this large image into a smaller area, like an image gallery. That'...
The WordPress theme will load the entire 5MP image (that’s 5 x 10^6 pixels) and ask the browser to shrink it to the required dimension of 150x150px. In essence, the browser displays only 0.0045% of the original image! You end up wasting both your and your visitor’s bandwidth (even...