Time to automate Image optimization and use HTML5 Image Srcsets
With the ochResponsiveImages system plugin, you can configure a set of breakpoints: sizes for devices you want to support. For each break-point an optimized image is automatically generated and cached. Your original image is replaced with an HTML srcset containing all the cached images. What will happen now is that the browser of the visitor will decide which image fits best on his/her screen and only download that specific cached image!