Delete the fresh-draw fence the self-reference rule made unreachable, and pay for the draw walks only where data binds a reference

graph.go

@@ -197,14 +197,25 @@ func checkRenders(s nodeScope) error {
 		return err
 	}
 	fence := &drawCheck{}
-	if err := s(fence.checkDrawGroup); err != nil {
+	// One pass refuses a draw group that splits nothing and notes whether the scope binds a
+	// reference at all: weighing what a render's draws hold walks every node it renders, and
+	// with nothing bound there is no draw to share, so the shipped set pays for neither walk.
+	refs := false
+	if err := s(func(path string, n node) error {
+		if t, ok := n.(*template); ok && len(t.refs) > 0 {
+			refs = true
+		}
+		return fence.checkDrawGroup(path, n)
+	}); err != nil {
 		return err
 	}
-	if err := s(fence.checkDraws); err != nil {
-		return err
-	}
-	if err := s(fence.checkRecordDraws); err != nil {
-		return err
+	if refs {
+		if err := s(fence.checkDraws); err != nil {
+			return err
+		}
+		if err := s(fence.checkRecordDraws); err != nil {
+			return err
+		}
 	}
 	return s((&valueProof{}).checkDatatype)
 }