Index: Objects/stringobject.c
===================================================================
--- Objects/stringobject.c	(.../p3yk)	(revision 53047)
+++ Objects/stringobject.c	(.../p3yk-noslice)	(revision 53047)
@@ -1223,6 +1200,17 @@
 		if (slicelength <= 0) {
 			return PyString_FromStringAndSize("", 0);
 		}
+		else if (start == 0 && step == 1 &&
+			 slicelength == PyString_GET_SIZE(self) &&
+			 PyString_CheckExact(self)) {
+			Py_INCREF(self);
+			return (PyObject *)self;
+		}
+		else if (step == 1) {
+			return PyString_FromStringAndSize(
+				PyString_AS_STRING(self) + start,
+				slicelength);
+		}
 		else {
 			source_buf = PyString_AsString((PyObject*)self);
 			result_buf = (char *)PyMem_Malloc(slicelength);
Index: Objects/unicodeobject.c
===================================================================
--- Objects/unicodeobject.c	(.../p3yk)	(revision 53047)
+++ Objects/unicodeobject.c	(.../p3yk-noslice)	(revision 53047)
@@ -7103,6 +7081,12 @@
 
         if (slicelength <= 0) {
             return PyUnicode_FromUnicode(NULL, 0);
+        } else if (start == 0 && step == 1 && slicelength == self->length &&
+                   PyUnicode_CheckExact(self)) {
+            Py_INCREF(self);
+            return (PyObject *)self;
+        } else if (step == 1) {
+            return PyUnicode_FromUnicode(self->str + start, slicelength);
         } else {
             source_buf = PyUnicode_AS_UNICODE((PyObject*)self);
             result_buf = (Py_UNICODE *)PyMem_MALLOC(slicelength*
Index: Objects/tupleobject.c
===================================================================
--- Objects/tupleobject.c	(.../p3yk)	(revision 53047)
+++ Objects/tupleobject.c	(.../p3yk-noslice)	(revision 53047)
@@ -603,6 +603,12 @@
 		if (slicelength <= 0) {
 			return PyTuple_New(0);
 		}
+		else if (start == 0 && step == 1 &&
+			 slicelength == PyTuple_GET_SIZE(self) &&
+			 PyTuple_CheckExact(self)) {
+			Py_INCREF(self);
+			return (PyObject *)self;
+		}
 		else {
 			result = PyTuple_New(slicelength);
 			if (!result) return NULL;