diff --git a/internal/data/business/analytics.go b/internal/data/business/analytics.go
index 070c521..1e09daa 100644
--- a/internal/data/business/analytics.go
+++ b/internal/data/business/analytics.go
@@ -27,14 +27,16 @@ func analyticsPromotes(db *gorm.DB, scope business.AnalyticsScope, f business.An
 		return q
 	}
 	keyword := strings.ToLower(strings.TrimSpace(f.PromoteName))
-	hits := analyticsBasePromotes(db, scope, f, "hit").Select("1").Where("INSTR(LOWER(hit.account),?)>0 OR INSTR(LOWER(hit.nickname),?)>0", keyword, keyword).Where("hit.source_db=" + alias + ".source_db")
+	hits := analyticsBasePromotes(db, scope, f, "hit").Where("INSTR(LOWER(hit.account),?)>0 OR INSTR(LOWER(hit.nickname),?)>0", keyword, keyword)
 	if scope.IncludeSub {
 		root := "CASE WHEN hit.promote_level=1 THEN hit.id WHEN hit.top_promote_id>0 THEN hit.top_promote_id ELSE hit.id END"
-		hits = hits.Where("(" + alias + ".id=(" + root + ") OR " + alias + ".top_promote_id=(" + root + "))")
-	} else {
-		hits = hits.Where("hit.id=" + alias + ".id")
+		roots := hits.Select("DISTINCT hit.source_db," + root)
+		// Uncorrelated sets let MySQL materialize matching roots once.
+		// A correlated OR/EXISTS can rescan all channels for every outer row,
+		// especially when a keyword matches nothing.
+		return q.Where("("+alias+".source_db,"+alias+".id) IN (?) OR ("+alias+".source_db,"+alias+".top_promote_id) IN (?)", roots, roots)
 	}
-	return q.Where("EXISTS (?)", hits)
+	return q.Where("("+alias+".source_db,"+alias+".id) IN (?)", hits.Select("hit.source_db,hit.id"))
 }
 func prepareAnalytics(db *gorm.DB, scope business.AnalyticsScope, f business.AnalyticsFilter) (bool, bool, error) {
 	if !scope.Viewer.All {