diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 2a8e64c7279..1c219ce319d 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1872,12 +1872,24 @@ RelationInitSequenceAccessMethod(Relation relation)
 	Oid			tableam_handler;
 
 	Assert(RELKIND_HAS_SEQUENCE_AM(relation->rd_rel->relkind));
+	Assert(relation->rd_rel->relam != InvalidOid);
 
 	/*
-	 * Look up the sequence access method, save the OID of its handler
-	 * function.
+	 * Fast path for the built-in "seqlocal" AM: avoid two syscache lookups
+	 * and a name-based pg_am scan on every cold-cache open of a sequence
+	 * using the default access method.
+	 *
+	 * This mirrors the catalog-relation fast path in
+	 * RelationInitTableAccessMethod() above.
 	 */
-	Assert(relation->rd_rel->relam != InvalidOid);
+	if (relation->rd_rel->relam == LOCAL_SEQUENCE_AM_OID)
+	{
+		relation->rd_amhandler = F_SEQ_LOCAL_SEQUENCEAM_HANDLER;
+		relation->rd_sequenceam = GetSequenceAmRoutine(relation->rd_amhandler);
+		relation->rd_tableam = GetTableAmRoutine(F_HEAP_TABLEAM_HANDLER);
+		return;
+	}
+
 	relation->rd_amhandler = GetSequenceAmRoutineId(relation->rd_rel->relam);
 
 	/*