Thanks for asking.
I am assuming that your intention is to optimize load time of images. You can take a look at plugin like Smush Image Compression and Optimization. https://wordpress.org/plugins/wp-smushit/
Additionally, if you just want to optimize the load time of images then one of the best option would be to use Jetpack. Jetpack has a feature that you can activate to load your images using there CDN. To learn more you can visit following article:
Other option is to use Cache plugin or a full featured CDN. Please note that using cache or a full featured plugin will also optimize the load time of your entire website. for cache plugin you can take a look at W3 Total Cache.
Regarding CDN, one of the most popular CDN provider is Cloudflare. https://www.cloudflare.com/cdn/
We have published an article that can be referred to optimize the page load time. https://theme.co/apex/forum/t/customizations-performance/210