diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 943bee6e21..8e1e76e081 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -1965,6 +1965,47 @@ unicode_asutf8andsize(PyObject *self, PyObject *args)
     return Py_BuildValue("(Nn)", result, utf8_len);
 }
 
+static PyObject *
+unicode_bench_asutf8(PyObject *self, PyObject *args)
+{
+    Py_ssize_t loops;
+    PyObject *s, *t;
+    if (!PyArg_ParseTuple(args, "lUU", &loops, &s, &t)) {
+        return NULL;
+    }
+
+    for (long i = 0; i < loops; i++) {
+        PyObject *u = PyNumber_Add(s, t);
+        assert(u != NULL);
+        const char *buff = PyUnicode_AsUTF8(u);
+        assert(buff != NULL);
+        Py_DECREF(u);
+    }
+
+    Py_RETURN_NONE;
+}
+
+static PyObject *
+unicode_bench_asutf8string(PyObject *self, PyObject *args)
+{
+    Py_ssize_t loops;
+    PyObject *s, *t;
+    if (!PyArg_ParseTuple(args, "lUU", &loops, &s, &t)) {
+        return NULL;
+    }
+
+    for (long i = 0; i < loops; i++) {
+        PyObject *u = PyNumber_Add(s, t);
+        assert(u != NULL);
+        PyObject *bytes = PyUnicode_AsUTF8String(u);
+        assert(bytes != NULL);
+        Py_DECREF(bytes);
+        Py_DECREF(u);
+    }
+
+    Py_RETURN_NONE;
+}
+
 static PyObject *
 unicode_findchar(PyObject *self, PyObject *args)
 {
@@ -5391,6 +5432,8 @@ static PyMethodDef TestMethods[] = {
     {"unicode_asucs4",          unicode_asucs4,                  METH_VARARGS},
     {"unicode_asutf8",          unicode_asutf8,                  METH_VARARGS},
     {"unicode_asutf8andsize",   unicode_asutf8andsize,           METH_VARARGS},
+    {"unicode_bench_asutf8",    unicode_bench_asutf8,            METH_VARARGS},
+    {"unicode_bench_asutf8string",    unicode_bench_asutf8string,            METH_VARARGS},
     {"unicode_findchar",        unicode_findchar,                METH_VARARGS},
     {"unicode_copycharacters",  unicode_copycharacters,          METH_VARARGS},
     {"unicode_encodedecimal",   unicode_encodedecimal,           METH_VARARGS},