diff --git a/mypyc/lib-rt/bytes_ops.c b/mypyc/lib-rt/bytes_ops.c
index 6ff34b021a9a..2129dcbff9ad 100644
--- a/mypyc/lib-rt/bytes_ops.c
+++ b/mypyc/lib-rt/bytes_ops.c
@@ -95,18 +95,22 @@ PyObject *CPyBytes_GetSlice(PyObject *obj, CPyTagged start, CPyTagged end) {
     return CPyObject_GetSlice(obj, start, end);
 }
 
+static PyObject *join_id_unicode = NULL;
+
 // Like _PyBytes_Join but fallback to dynamic call if 'sep' is not bytes
 // (mostly commonly, for bytearrays)
 PyObject *CPyBytes_Join(PyObject *sep, PyObject *iter) {
     if (PyBytes_CheckExact(sep)) {
         return PyBytes_Join(sep, iter);
     } else {
-        _Py_IDENTIFIER(join);
-        PyObject *name = _PyUnicode_FromId(&PyId_join); /* borrowed */
-        if (name == NULL) {
-            return NULL;
+        if (join_id_unicode == NULL) {
+            _Py_IDENTIFIER(join);
+            join_id_unicode = _PyUnicode_FromId(&PyId_join); /* borrowed */
+            if (join_id_unicode == NULL) {
+                return NULL;
+            }
         }
-        return PyObject_CallMethodOneArg(sep, name, iter);
+        return PyObject_CallMethodOneArg(sep, join_id_unicode, iter);
     }
 }
 
diff --git a/mypyc/lib-rt/dict_ops.c b/mypyc/lib-rt/dict_ops.c
index b102aba57307..1892116d7798 100644
--- a/mypyc/lib-rt/dict_ops.c
+++ b/mypyc/lib-rt/dict_ops.c
@@ -9,6 +9,16 @@
 #define Py_TPFLAGS_MAPPING (1 << 6)
 #endif
 
+// Caching _PyUnicode_FromId results for identifiers
+static PyObject *setdefault_id_unicode = NULL;
+static PyObject *update_id_unicode = NULL;
+static PyObject *keys_id_unicode = NULL;
+static PyObject *values_id_unicode = NULL;
+static PyObject *items_id_unicode = NULL;
+// dict_ prefix prevents a name conflict with list_ops
+static PyObject *dict_copy_id_unicode = NULL;
+static PyObject *dict_clear_id_unicode = NULL;
+
 // Dict subclasses like defaultdict override things in interesting
 // ways, so we don't want to just directly use the dict methods. Not
 // sure if it is actually worth doing all this stuff, but it saves
@@ -77,12 +87,14 @@ PyObject *CPyDict_SetDefault(PyObject *dict, PyObject *key, PyObject *value) {
         Py_XINCREF(ret);
         return ret;
     }
-    _Py_IDENTIFIER(setdefault);
-    PyObject *name = _PyUnicode_FromId(&PyId_setdefault); /* borrowed */
-    if (name == NULL) {
-        return NULL;
+    if (setdefault_id_unicode == NULL) {
+        _Py_IDENTIFIER(setdefault);
+        setdefault_id_unicode = _PyUnicode_FromId(&PyId_setdefault); /* borrowed */
+        if (setdefault_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    return PyObject_CallMethodObjArgs(dict, name, key, value, NULL);
+    return PyObject_CallMethodObjArgs(dict, setdefault_id_unicode, key, value, NULL);
 }
 
 PyObject *CPyDict_SetDefaultWithNone(PyObject *dict, PyObject *key) {
@@ -136,12 +148,14 @@ static inline int CPy_ObjectToStatus(PyObject *obj) {
 }
 
 static int CPyDict_UpdateGeneral(PyObject *dict, PyObject *stuff) {
-    _Py_IDENTIFIER(update);
-    PyObject *name = _PyUnicode_FromId(&PyId_update); /* borrowed */
-    if (name == NULL) {
-        return -1;
+    if (update_id_unicode == NULL) {
+        _Py_IDENTIFIER(update);
+        update_id_unicode = _PyUnicode_FromId(&PyId_update); /* borrowed */
+        if (update_id_unicode == NULL) {
+            return -1;
+        }
     }
-    PyObject *res = PyObject_CallMethodOneArg(dict, name, stuff);
+    PyObject *res = PyObject_CallMethodOneArg(dict, update_id_unicode, stuff);
     return CPy_ObjectToStatus(res);
 }
 
@@ -207,36 +221,42 @@ PyObject *CPyDict_KeysView(PyObject *dict) {
     if (PyDict_CheckExact(dict)){
         return _CPyDictView_New(dict, &PyDictKeys_Type);
     }
-    _Py_IDENTIFIER(keys);
-    PyObject *name = _PyUnicode_FromId(&PyId_keys); /* borrowed */
-    if (name == NULL) {
-        return NULL;
+    if (keys_id_unicode == NULL) {
+        _Py_IDENTIFIER(keys);
+        keys_id_unicode = _PyUnicode_FromId(&PyId_keys); /* borrowed */
+        if (keys_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    return PyObject_CallMethodNoArgs(dict, name);
+    return PyObject_CallMethodNoArgs(dict, keys_id_unicode);
 }
 
 PyObject *CPyDict_ValuesView(PyObject *dict) {
     if (PyDict_CheckExact(dict)){
         return _CPyDictView_New(dict, &PyDictValues_Type);
     }
-    _Py_IDENTIFIER(values);
-    PyObject *name = _PyUnicode_FromId(&PyId_values); /* borrowed */
-    if (name == NULL) {
-        return NULL;
+    if (values_id_unicode == NULL) {
+        _Py_IDENTIFIER(values);
+        values_id_unicode = _PyUnicode_FromId(&PyId_values); /* borrowed */
+        if (values_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    return PyObject_CallMethodNoArgs(dict, name);
+    return PyObject_CallMethodNoArgs(dict, values_id_unicode);
 }
 
 PyObject *CPyDict_ItemsView(PyObject *dict) {
     if (PyDict_CheckExact(dict)){
         return _CPyDictView_New(dict, &PyDictItems_Type);
     }
-    _Py_IDENTIFIER(items);
-    PyObject *name = _PyUnicode_FromId(&PyId_items); /* borrowed */
-    if (name == NULL) {
-        return NULL;
+    if (items_id_unicode == NULL) {
+        _Py_IDENTIFIER(items);
+        items_id_unicode = _PyUnicode_FromId(&PyId_items); /* borrowed */
+        if (items_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    return PyObject_CallMethodNoArgs(dict, name);
+    return PyObject_CallMethodNoArgs(dict, items_id_unicode);
 }
 
 PyObject *CPyDict_Keys(PyObject *dict) {
@@ -245,12 +265,14 @@ PyObject *CPyDict_Keys(PyObject *dict) {
     }
     // Inline generic fallback logic to also return a list.
     PyObject *list = PyList_New(0);
-    _Py_IDENTIFIER(keys);
-    PyObject *name = _PyUnicode_FromId(&PyId_keys); /* borrowed */
-    if (name == NULL) {
-        return NULL;
+    if (keys_id_unicode == NULL) {
+        _Py_IDENTIFIER(keys);
+        keys_id_unicode = _PyUnicode_FromId(&PyId_keys); /* borrowed */
+        if (keys_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    PyObject *view = PyObject_CallMethodNoArgs(dict, name);
+    PyObject *view = PyObject_CallMethodNoArgs(dict, keys_id_unicode);
     if (view == NULL) {
         return NULL;
     }
@@ -268,12 +290,14 @@ PyObject *CPyDict_Values(PyObject *dict) {
     }
     // Inline generic fallback logic to also return a list.
     PyObject *list = PyList_New(0);
-    _Py_IDENTIFIER(values);
-    PyObject *name = _PyUnicode_FromId(&PyId_values); /* borrowed */
-    if (name == NULL) {
-        return NULL;
+    if (values_id_unicode == NULL) {
+        _Py_IDENTIFIER(values);
+        values_id_unicode = _PyUnicode_FromId(&PyId_values); /* borrowed */
+        if (values_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    PyObject *view = PyObject_CallMethodNoArgs(dict, name);
+    PyObject *view = PyObject_CallMethodNoArgs(dict, values_id_unicode);
     if (view == NULL) {
         return NULL;
     }
@@ -291,12 +315,14 @@ PyObject *CPyDict_Items(PyObject *dict) {
     }
     // Inline generic fallback logic to also return a list.
     PyObject *list = PyList_New(0);
-    _Py_IDENTIFIER(items);
-    PyObject *name = _PyUnicode_FromId(&PyId_items); /* borrowed */
-    if (name == NULL) {
-        return NULL;
+    if (items_id_unicode == NULL) {
+        _Py_IDENTIFIER(items);
+        items_id_unicode = _PyUnicode_FromId(&PyId_items); /* borrowed */
+        if (items_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    PyObject *view = PyObject_CallMethodNoArgs(dict, name);
+    PyObject *view = PyObject_CallMethodNoArgs(dict, items_id_unicode);
     if (view == NULL) {
         return NULL;
     }
@@ -312,12 +338,14 @@ char CPyDict_Clear(PyObject *dict) {
     if (PyDict_CheckExact(dict)) {
         PyDict_Clear(dict);
     } else {
-        _Py_IDENTIFIER(clear);
-        PyObject *name = _PyUnicode_FromId(&PyId_clear); /* borrowed */
-        if (name == NULL) {
-            return 0;
+        if (dict_clear_id_unicode == NULL) {
+            _Py_IDENTIFIER(clear);
+            dict_clear_id_unicode = _PyUnicode_FromId(&PyId_clear); /* borrowed */
+            if (dict_clear_id_unicode == NULL) {
+                return 0;
+            }
         }
-        PyObject *res = PyObject_CallMethodNoArgs(dict, name);
+        PyObject *res = PyObject_CallMethodNoArgs(dict, dict_clear_id_unicode);
         if (res == NULL) {
             return 0;
         }
@@ -329,12 +357,14 @@ PyObject *CPyDict_Copy(PyObject *dict) {
     if (PyDict_CheckExact(dict)) {
         return PyDict_Copy(dict);
     }
-    _Py_IDENTIFIER(copy);
-    PyObject *name = _PyUnicode_FromId(&PyId_copy); /* borrowed */
-    if (name == NULL) {
-        return NULL;
+    if (dict_copy_id_unicode == NULL) {
+        _Py_IDENTIFIER(copy);
+        dict_copy_id_unicode = _PyUnicode_FromId(&PyId_copy); /* borrowed */
+        if (dict_copy_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    return PyObject_CallMethodNoArgs(dict, name);
+    return PyObject_CallMethodNoArgs(dict, dict_copy_id_unicode);
 }
 
 PyObject *CPyDict_GetKeysIter(PyObject *dict) {
@@ -352,12 +382,14 @@ PyObject *CPyDict_GetItemsIter(PyObject *dict) {
         Py_INCREF(dict);
         return dict;
     }
-    _Py_IDENTIFIER(items);
-    PyObject *name = _PyUnicode_FromId(&PyId_items); /* borrowed */
-    if (name == NULL) {
-        return NULL;
+    if (items_id_unicode == NULL) {
+        _Py_IDENTIFIER(items);
+        items_id_unicode = _PyUnicode_FromId(&PyId_items); /* borrowed */
+        if (items_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    PyObject *view = PyObject_CallMethodNoArgs(dict, name);
+    PyObject *view = PyObject_CallMethodNoArgs(dict, items_id_unicode);
     if (view == NULL) {
         return NULL;
     }
@@ -372,12 +404,14 @@ PyObject *CPyDict_GetValuesIter(PyObject *dict) {
         Py_INCREF(dict);
         return dict;
     }
-    _Py_IDENTIFIER(values);
-    PyObject *name = _PyUnicode_FromId(&PyId_values); /* borrowed */
-    if (name == NULL) {
-        return NULL;
+    if (values_id_unicode == NULL) {
+        _Py_IDENTIFIER(values);
+        values_id_unicode = _PyUnicode_FromId(&PyId_values); /* borrowed */
+        if (values_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    PyObject *view = PyObject_CallMethodNoArgs(dict, name);
+    PyObject *view = PyObject_CallMethodNoArgs(dict, values_id_unicode);
     if (view == NULL) {
         return NULL;
     }
diff --git a/mypyc/lib-rt/list_ops.c b/mypyc/lib-rt/list_ops.c
index c611907fb601..e9f6c6d9f3fe 100644
--- a/mypyc/lib-rt/list_ops.c
+++ b/mypyc/lib-rt/list_ops.c
@@ -9,6 +9,10 @@
 #define Py_TPFLAGS_SEQUENCE (1 << 5)
 #endif
 
+// list_ prefix prevents a name conflict with dict_ops
+static PyObject *list_clear_id_unicode = NULL;
+static PyObject *list_copy_id_unicode = NULL;
+
 PyObject *CPyList_Build(Py_ssize_t len, ...) {
     Py_ssize_t i;
 
@@ -33,12 +37,14 @@ char CPyList_Clear(PyObject *list) {
     if (PyList_CheckExact(list)) {
         PyList_Clear(list);
     } else {
-        _Py_IDENTIFIER(clear);
-        PyObject *name = _PyUnicode_FromId(&PyId_clear);
-        if (name == NULL) {
-            return 0;
+        if (list_clear_id_unicode == NULL) {
+            _Py_IDENTIFIER(clear);
+            list_clear_id_unicode = _PyUnicode_FromId(&PyId_clear);
+            if (list_clear_id_unicode == NULL) {
+                return 0;
+            }
         }
-        PyObject *res = PyObject_CallMethodNoArgs(list, name);
+        PyObject *res = PyObject_CallMethodNoArgs(list, list_clear_id_unicode);
         if (res == NULL) {
             return 0;
         }
@@ -50,13 +56,14 @@ PyObject *CPyList_Copy(PyObject *list) {
     if(PyList_CheckExact(list)) {
         return PyList_GetSlice(list, 0, PyList_GET_SIZE(list));
     }
-    _Py_IDENTIFIER(copy);
-
-    PyObject *name = _PyUnicode_FromId(&PyId_copy);
-    if (name == NULL) {
-        return NULL;
+    if (list_copy_id_unicode == NULL) {
+        _Py_IDENTIFIER(copy);
+        list_copy_id_unicode = _PyUnicode_FromId(&PyId_copy);
+        if (list_copy_id_unicode == NULL) {
+            return NULL;
+        }
     }
-    return PyObject_CallMethodNoArgs(list, name);
+    return PyObject_CallMethodNoArgs(list, list_copy_id_unicode);
 }
 
 PyObject *CPyList_GetItemShort(PyObject *list, CPyTagged index) {
diff --git a/mypyc/lib-rt/misc_ops.c b/mypyc/lib-rt/misc_ops.c
index ca09c347b4ff..ace2c480349b 100644
--- a/mypyc/lib-rt/misc_ops.c
+++ b/mypyc/lib-rt/misc_ops.c
@@ -20,6 +20,8 @@ PyObject *CPy_GetCoro(PyObject *obj)
     }
 }
 
+static PyObject *send_id_unicode = NULL;
+
 PyObject *CPyIter_Send(PyObject *iter, PyObject *val)
 {
     // Do a send, or a next if second arg is None.
@@ -27,12 +29,14 @@ PyObject *CPyIter_Send(PyObject *iter, PyObject *val)
     if (Py_IsNone(val)) {
         return CPyIter_Next(iter);
     } else {
-        _Py_IDENTIFIER(send);
-        PyObject *name = _PyUnicode_FromId(&PyId_send); /* borrowed */
-        if (name == NULL) {
-            return NULL;
+        if (send_id_unicode == NULL) {
+            _Py_IDENTIFIER(send);
+            send_id_unicode = _PyUnicode_FromId(&PyId_send); /* borrowed */
+            if (send_id_unicode == NULL) {
+                return NULL;
+            }
         }
-        return PyObject_CallMethodOneArg(iter, name, val);
+        return PyObject_CallMethodOneArg(iter, send_id_unicode, val);
     }
 }
 
@@ -1058,14 +1062,21 @@ PyObject *CPy_GetANext(PyObject *aiter)
 
 #if CPY_3_11_FEATURES
 
+static PyObject *__name___id_unicode = NULL;
+
 // Return obj.__name__ (specialized to type objects, which are the most common target).
 PyObject *CPy_GetName(PyObject *obj) {
     if (PyType_Check(obj)) {
         return PyType_GetName((PyTypeObject *)obj);
     }
-    _Py_IDENTIFIER(__name__);
-    PyObject *name = _PyUnicode_FromId(&PyId___name__); /* borrowed */
-    return PyObject_GetAttr(obj, name);
+    if (__name___id_unicode == NULL) {
+        _Py_IDENTIFIER(__name__);
+        __name___id_unicode = _PyUnicode_FromId(&PyId___name__); /* borrowed */
+        if (__name___id_unicode == NULL) {
+            return NULL;
+        }
+    }
+    return PyObject_GetAttr(obj, __name___id_unicode);
 }
 
 #endif