I'll let the experts answer that in detail, but in my experience the standard API-based rules (not the advanced rules) work with AdGuard not running and do block ads/trackers/etc. They just aren't quite as good and can't do fancy stuff, and you can't add/modify rules on the fly. I don't notice a performance difference with them on vs. off, just the battery drain with them on. Hopefully there will be an update soon to address that!Is background app required for AdGuard Advanced Blocking? For the sake of performance and reliability I would prefer blocking via Apple's native Content Blocking API only without any stand-alone bells and whistles. Can I achieve this by disabling Advanced Blocking extension? Will AdGuard generate errors because it can't process advanced filters without Advanced extension?