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Hello @valerio_cas ,
We are currently not familiar with the specific hooks utilized by the aforementioned plugin. For detailed information, we recommend consulting the plugin’s developers regarding the hooks they employ. However, I can confirm that the hook wp_trash_post will automatically purge the cache, provided that automatic purging is enabled in the Speed Optimizer plugin.
Additionally, the automatic cache purge is triggered by the save_post hook, which is applicable when posts are deleted or edited.
Best regards,
Georgi Ganchev
SiteGround.com