diff --git a/il65/oldstuff/codegen.py b/il65/oldstuff/codegen.py
index 7267a4e2f..7404e42c3 100644
--- a/il65/oldstuff/codegen.py
+++ b/il65/oldstuff/codegen.py
@@ -2,9 +2,6 @@
 
 
 class CodeGenerator:
-    BREAKPOINT_COMMENT_SIGNATURE = "~~~BREAKPOINT~~~"
-    BREAKPOINT_COMMENT_DETECTOR = r".(?P<address>\w+)\s+ea\s+nop\s+;\s+{:s}.*".format(BREAKPOINT_COMMENT_SIGNATURE)
-
     def generate_call(self, stmt: CallStmt) -> None:
         self.p("\t\t\t\t\t; " + stmt.lineref)
         if stmt.condition:
diff --git a/il65/plyparse.py b/il65/plyparse.py
index 3786d7c05..e5a100e02 100644
--- a/il65/plyparse.py
+++ b/il65/plyparse.py
@@ -87,17 +87,18 @@ class AstNode:
         raise LookupError("no scope found in node ancestry", self)
 
     def all_nodes(self, *nodetypes: type) -> Generator['AstNode', None, None]:
-        nodetypes = nodetypes or (AstNode, )
-        if self.nodes is None:
-            # this is the case when a node has been pruned away
+        if not self.nodes:
+            # this is the case when a node has been pruned away (nodes=None) or we don't have any child nodes
             return
         child_nodes = list(self.nodes)
+        if nodetypes:
+            for node in child_nodes:
+                if isinstance(node, nodetypes):
+                    yield node
+        else:
+            yield from child_nodes
         for node in child_nodes:
-            if isinstance(node, nodetypes):
-                yield node
-        for node in child_nodes:
-            if isinstance(node, AstNode):
-                yield from node.all_nodes(*nodetypes)
+            yield from node.all_nodes(*nodetypes)
 
     def remove_node(self, node: 'AstNode') -> None:
         assert node.parent is self
diff --git a/run_profile.py b/run_profile.py
new file mode 100644
index 000000000..b09de680a
--- /dev/null
+++ b/run_profile.py
@@ -0,0 +1,12 @@
+import cProfile
+from il65.compile import PlyParser
+from il65.optimize import optimize
+
+
+def parse():
+    parser = PlyParser(enable_floats=True)
+    parsed_module = parser.parse_file("testsource/large.ill")
+    optimize(parsed_module)
+
+
+cProfile.run("parse()", filename="profile.dat")