Uploaded images are now automatically optimized to ensure faster load times, smaller email sizes, and consistent quality across devices. The optimization happens instantly on upload, so even the preview in the editor reflects the optimized version. This improves deliverability and keeps campaigns looking sharp without requiring any extra steps from users.

For more details, see: https://help.d.io/en/articles/12053769-automatic-image-optimization-in-the-email-builder