diff --git a/Lib/turtledemo/__main__.py b/Lib/turtledemo/__main__.py
index 7c2d753f4c3111..cffc08f59b99d2 100644
--- a/Lib/turtledemo/__main__.py
+++ b/Lib/turtledemo/__main__.py
@@ -333,7 +333,7 @@ def loadfile(self, filename):
         modname = 'turtledemo.' + filename
         __import__(modname)
         self.module = sys.modules[modname]
-        with open(self.module.__file__, 'r') as f:
+        with open(self.module.__file__, encoding='utf-8') as f:
             chars = f.read()
         self.text.delete("1.0", "end")
         self.text.insert("1.0", chars)
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-09-20-12-11-01.gh-issue-157840.EAo1Kp.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-09-20-12-11-01.gh-issue-157840.EAo1Kp.rst
new file mode 100644
index 00000000000000..c2212267ce6fa4
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-09-20-12-11-01.gh-issue-157840.EAo1Kp.rst
@@ -0,0 +1,2 @@
+Speed up calls to :func:`hasattr` and three-argument :func:`getattr` for
+unassigned attributes in an object's :attr:`~object.__slots__` by roughly 6x.
diff --git a/Misc/NEWS.d/next/Library/2026-07-08-19-40-00.gh-issue-153319.Qk7bE2.rst b/Misc/NEWS.d/next/Library/2026-07-08-19-40-00.gh-issue-153319.Qk7bE2.rst
new file mode 100644
index 00000000000000..95f8e2fb7f4f8b
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-07-08-19-40-00.gh-issue-153319.Qk7bE2.rst
@@ -0,0 +1,2 @@
+The :mod:`turtledemo` viewer now reads each demo script as UTF-8 instead of
+the locale encoding.
diff --git a/Objects/object.c b/Objects/object.c
index 971ac1b7a68669..c7aeba0cee22c6 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -1924,6 +1924,19 @@ _PyObject_GenericGetAttrWithDict(PyObject *obj, PyObject *name,
     if (descr != NULL) {
         f = Py_TYPE(descr)->tp_descr_get;
         if (f != NULL && PyDescr_IsData(descr)) {
+            // gh-157840: We special-case member descriptors here to avoid
+            // allocating an extra AttributeError
+            if (suppress && Py_IS_TYPE(descr, &PyMemberDescr_Type)) {
+                PyMemberDef *member = ((PyMemberDescrObject *)descr)->d_member;
+                if (member->type == Py_T_OBJECT_EX
+                    && !(member->flags & Py_AUDIT_READ)
+                    && PyObject_TypeCheck(obj, PyDescr_TYPE(descr))) {
+                    PyObject **addr = _PyMember_GetOffset(obj, member);
+                    if (FT_ATOMIC_LOAD_PTR(*addr) == NULL) {
+                        goto done;
+                    }
+                }
+            }
             res = f(descr, obj, (PyObject *)Py_TYPE(obj));
             if (res == NULL && suppress &&
                     PyErr_ExceptionMatches(PyExc_AttributeError)) {