Hi!
On the Caching Opitons submenu you can turn on the Crop images for caching option. It will create a smaller matching size of each image and store it in the plugin cache directory. This might affect the performance at first, but after the images are cached it should fall back to normal.
In upcoming versions there will be an option to choose a different source image size for featured images, once I finish testing it 🙂
Best,Ernest Marcinko
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