We get asked all the time about the Wordpress heath check message about imagick. imagick is a command line based image processor, and we don't run imagick on our servers at all.

There are benefits to using imagick including lower image sizes in slightly better quality ranges but we found the performance and integration a downside for imagick on our servers. PHP has a built in image processor for scaling and resizing images and any plugins using imagick should automatically just use the default options in PHP for image scaling, and some plugins like smush use external servers to run and process the images.

At the end of the day the message about imagick can be ignored. We might revisit the inclusion of it in the future but at this time we wont be running imagick.
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