performance improvement

tournaments/models/round.py

@@ -55,8 +55,10 @@ class Round(TournamentSubModel):
         return name
 
     def ranking_matches(self, hide_empty_matches):
+
+        children_with_matches = self.children.prefetch_related('matches')
         matches = []
-        for child in self.children.all():
+        for child in children_with_matches:
 
             child_matches = child.matches.all()
             if hide_empty_matches: