Optimize Images Resizing

If you were ever annoyed about the way WordPress handles images resizing, this is a plugin for you. What this plugin does is it optimizes the image handling in such a way that images are resized only when they are actually needed. What that means is that if your plugins/theme define a lot of image sizes, none of them will be generated on the image upload (like they would be usually), but only if they are actually requested in that size. Resizing is done only once and later normally served by WordPress, so there is no performance hit. Plugin also includes a method for removing all of the image sizes generated so far (useful when you install this plugin on a site with a lot of existing media). TO REMOVE image sizes generated prior to activating the plugin, visit the Settings -> Media and use the button under "Remove image sizes" to perform the cleanup. Other than that, you don't need to do anything, plugin works silently in the background. To sum up:

• Resize images only when needed
• Clean up existing images sizes
• No performance hit
• Free up your hosting space

1.3.0

• Improve the plugin UI and UX by providing a more meaningful feedback (plugin will now tell you how many images it removed exactly and show the list of files that got removed).
• Introduce WP-CLI support (props @charlesLF).
• Fix issues with the plugin localization support.
• Declare WordPress 4.5 compatibility.

1.2.1

• Declare WordPress 4.4 compatibility.

1.2.0

• Improve performance by returning the correct response after image is resized.
• Improve performance by returning response immediately if image size is already found.
• Avoid removing image sizes that are added via 'image_size_names_choose' filter (they get generated anyway on the Media screen).

1.1.0

• Improve the process of removing unwanted image sizes on image upload (props @bcole808)

1.0.9

• Declare WordPress 4.3 support

1.0.8

• Fix compatibility issue in specific scenarios

1.0.7

• Fix issue where cleanup process would get stuck on certain images.

1.0.6

• Fix issue where default image size would not be generated after cleanup, if a custom image size of the same dimensions is defined.

1.0.5

• Fix issue where full image size would be duplicated when width and height are both set to 0.

1.0.4

• Fix issue with cleaning up images from media settings screen.

1.0.3

• Plugin no longer removes any of the default WordPress image sizes.

1.0.2

• Fixed issue where image sizes were not listed in some places inside admin area.

1.0.1

• Fixed issue where images would be regenerated even when not needed.

1.0.0

• Initial version.