Google Pagespeed still reporting?

Hi,

First thanks for creating this plugin! I’ve tried it on our website. After installing it, I notice Google Pagespeed is still reporting the old image, as well as the resized one.

https://developers.google.com/speed/pagespeed/insights/?hl=nl&url=www.loqed.com

…02/autumn_loqed.jpg(www.loqed.com) 775 KB
…02/autumn_loqed-768×512.jpg(www.loqed.com) 145 KB

Any idea why Google is still showing the old image as well?