Performance changes depending upon the rule list provided to Safari. A better (not necessarily larger) rule list means that more unnecessary items are blocked a

Performance changes depending upon the rule list provided to Safari. A better (not necessarily larger) rule list means that more unnecessary items are blocked and web pages therefore load more quickly. This means that there can be a large difference between ad blockers even if they use the same underlying blocking mechanism. As you note, the rule quality is also important. We judge our rule quality based upon: - How many ads, trackers and annoyances it blocks - How frequently rules are updated to meet changes to pages - How large is the rule set and does it include out of date and redundant items (many ad blockers have overly large rulesets that increase memory use and reduce maintainability; including 1Blocker) - Not breaking any required web page functionality