Optimizing your images on your website can help with improving your website performance.
At best it helps the speed at which your website loads as well the server resource usage.
The final images respond to the Google requirements of speed loading so the web pages loading speed will be improved after use of the EWWW Image Optimizer plugin.
It can automatically optimize your images without sacrificing the quality of the image or greatly reduce picture size with inconspicuous loss of quality.
WordPress will then handle the download and installation of the EWWW Image Optimizer plugin. Once complete, be sure to click the Activate Plugin link to ensure that it is active on your site.
Now that you have installed the EWWW Image Optimizer plugin and you can configure it.
By default settings use Lossless compression, that little reduce images size.
I recommend that you get an API key that will allow you to use lossy compression. Which in some cases reduces the weight of images by 70-80%.
Moreover, the tariffs are quite friendly. For one dollar, you can optimize more than 30,000 images.
You can Bulk Optimize you images
Just click "Media" -> Bulk Optimize
Scan and Start.
We also recommend to read How to Search Engine image Optimization.