Optimisation settings for performance and display at least 8.20.0
Optimisation settings for performance and display
The optimisation settings include the following functions:
- Cache
The cache and logging are controlled by this setting. In live mode, the cache should be activated for optimum performance, but deactivated in development mode to make changes visible immediately. - WEBP compression for images
If this option is activated, all PNG and JPG images are automatically converted to WEBP format. This applies in particular to images that are delivered via show_bild.php and index.php - i.e. around 90 % of all images on the page. - Automatic image compression
Previously, JPG images were processed by default with a compression rate of 90 % via show_bild.php. Now the compression level can be set directly in the admin interface. The function includes all JPG and WEBP images, including those delivered via index.php. The default value is now set to 80 %. - Maximum image size
The maximum pixel size for the delivery of images can be set here. The default value is 1,500 pixels. If larger images are to be used for content or e.g. headers, this value must be adjusted accordingly. If an image is inserted that exceeds the maximum size, the server automatically scales it to the specified maximum width or height during delivery. The original image remains unchanged in the system; only the delivered version is scaled down. Smaller images (under 1,500 pixels) remain unaffected unless the image size is explicitly specified, e.g. in the Tiny tool. - Delete image cache
This function is still available under "Administration -> zCMS" and is offered here again for completeness. Images are processed in zCMS the first time they are called up and saved in a cache directory. If an image has already been converted once, it is loaded directly from this directory without being processed again. After changes to the above parameters, the image cache must be emptied to ensure that the updated settings are applied to all images and that outdated cache versions are not used.