My old theme always created a version of the 375×175 size images and used them as thumbnails in the archives and homepage. Example:
2017/07/sinais-375×175.jpg
But now in this new theme, in the pages of the files the image in focus does is pull the original image and create a link similar to this:
2017/07/sinais.jpg?resize=375%2C175&ssl=1
How do I set the theme to do just like it used to? Use the 375×175 images in the archives, categories and home page as a thumbnail instead of using resize?
This resize is disrupting the loading of the site, taking up to 3 seconds to generate these images … Decreasing my score in gmtrix and pingdom