Greg - SiteOrigin

I built this plugin to help ease the transition during a DNS changeover, but you can use it any way you please. It turns your WordPress installation into a very simple proxy server. It fetches content from another URL, caches it and displays it. Requests are cached for 24 hours.
Install the plugin, then head over to Settings > Simple Proxy in your WordPress admin. Enter the URL you want to proxy to and when you’re ready to go, also check the enabled checkbox.
You need to have <a href="https://codex.wordpress.org/Using_Permalinks#Choosing_your_permalink_structure" rel="nofollow ugc">pretty permalinks</a> enabled.
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Simple Proxy

Turns your WordPress installation into a simple caching proxy.

muzuiget

If you can not directly access image links or the loading is slowly, this script will rewrite the image 
links to googleusercontent.com proxy address. With Google server you can display image normally and load 
faster.

Google Image Proxy

Rewrite the image address to googleusercontent.com proxy address.

Simple Proxy vs Google Image Proxy