We have prepared another article with many useful information about how to speed up Wordpress site.
This time we are focusing on image optimization.
Images are very often the largest site's part and the image compression is just very important.
We have listed some awesome online tools that make this process easier.
But that is not all. This article tutorial contains more suggestions that can be really helpful.
So you can learn more about the proper file format or about using free CDN services for example.