woothemes/woocommerce — pull request #5544 by splashingpixels (2014-05-23 03:22:26+00:00)
Title: return thumb size of variation image on upload

Instead of loading the full size of the image in preview, load the thumbnail size to improve performance. In addition added a more specific level of replacement to prevent replacing any/all images in the area if 3rd party plugin is adding content there.