EWWW Image Optimizer Integration

The integration runs when EWWW_IMAGE_OPTIMIZER_VERSION is defined, the EWWW_Image_Optimizer class is available, and ewww_image_optimizer_get_option() exists. There is no manual toggle.

Conflicting settings disabled by ZiziCache

After ZiziCache settings are saved (zizi_cache_update_config:after), it disables these EWWW options:

• ewww_image_optimizer_lazy_load
• ewww_image_optimizer_picture_webp
• ewww_image_optimizer_js_webp
• ewww_image_optimizer_webp_for_cdn
• ewww_image_optimizer_auto
• ewww_image_optimizer_delay_js

Options are only turned off when they were enabled.

Compatible defaults it may set

If these EWWW options are missing, ZiziCache may set default values during coordination:

• ewww_image_optimizer_metadata_remove = true
• ewww_image_optimizer_jpg_quality = 90
• ewww_image_optimizer_png_level = 6
• ewww_image_optimizer_backup_files = true

Lazy loading

ZiziCache blocks enabling EWWW lazy load via pre_update_option_ewww_image_optimizer_lazy_load and shows an admin notice. Configure lazy loading in ZiziCache (ZiziCache → Optimization → Images).

WebP coordination

• If ewww_image_optimizer_webp is disabled, ZiziCache enables it.
• When WebP is available, it adds a zizi_webp_eligible flag to results from wp_get_attachment_image_src and wp_calculate_image_srcset.
• The integration does not rewrite image URLs to .webp and does not generate elements.

Cache invalidation on optimization

• On ewww_image_optimizer_post_optimization it stores stats in zizi_cache_ewww_stats.
• On ewww_image_optimizer_optimize_attachment it deletes object-cache keys based on attachment ID.
• On file optimization it deletes object-cache keys derived from the file path.
• On ewww_image_optimizer_webp_cleanup it runs wp_cache_flush().
• It does not purge HTML page cache for pages where the image appears in content.

Admin UI and visible output

On the EWWW settings page a “ZiziCache Coordination” block is rendered with coordination notes and optional stats. On the frontend for logged-in admins, ZiziCache may add an HTML comment summary if zizi_cache_ewww_stats exists.

How to work with the integration

1. Configure lazy loading only in ZiziCache.
2. Configure image optimization and WebP generation in EWWW. Some options are automatically disabled (see above).
3. After bulk optimization, you can manually purge ZiziCache via the UI or wp zizi-cache purge-everything.

Disable the integration (optional)

You can disable the integration via the zizi_cache_disabled_integrations filter:

add_filter('zizi_cache_disabled_integrations', function($integrations) {
    $integrations[] = ZiziCachePluginsIntegrationsEWWW::class;
    return $integrations;
});