Using the tag syntax no working

Hello @lewshop,

The two options to deliver next-generation images (like WebP and/or AVIF) are present in our plugin options, because of the differences between websites and the way the images are added to the page source. If most of the images from your website are not present inside the post content (this is usually the case for blogs and news websites), but various plugins are adding the images outside of “the_content” area in WordPress, the solution is to use the Global hook and our plugin will process the entire page source. Indeed, this solution can be slower sometimes, depending on many factors, such as the hosting server resources and the number of images on each page (because our plugin checks which images are present in your uploads folder to prevent broken images).

However, if you are using a CDN and caching on your website, this slowness should only impact the site for the first time when those pages are generated, because after that, they should be cached and served by WP Rocket and Rocket CDN. Have you also checked your website in an incognito window to check if the slowness is still there?

Alternatively, I would suggest you to try the CDN delivery from our plugin, it should not have any slow-down effect on your website.