Images loaded from other site

Hi,

I have a lot of files coming from a 2rd party urls/domains which can’t covered by the CDN service that I use, resulting that very few of the images are coming via the CDN. This is most likely caused by some bulk setting or theme references pointing to these urls.

However, when I examine this via a test https://tools.pingdom.com/fpt/#!/HbnsOYF6j/https://www.bigdata-startups.com/, I see that a lot of files are coming from for example: https://i2.wp.com/www.bigdata-startups.com/wp-content/uploads/2012/12/QunB-thumbnail.jpg?resize=465%2C346

How can I solve that that the “i2.wp.com” part is removed?

Thanks!

Mark