Got rid of special case for Macintosh realloc slowdown: Tim fixed the problem.

Lib/test/test_import.py

@@ -107,5 +107,4 @@ def test_module_with_large_stack(module):
         if os.path.exists(fname):
             os.unlink(fname)
 
-if sys.platform != 'mac':
-    test_module_with_large_stack('longlist')
+test_module_with_large_stack('longlist')

Lib/test/test_longexp.py

@@ -5,10 +5,6 @@ from test_support import TestFailed, TestSkipped
 
 REPS = 65580
 
-if sys.platform == 'mac':
-    import gestalt
-    if gestalt.gestalt('sysv') > 0x9ff:
-        raise TestSkipped, 'Triggers pathological malloc slowdown on OSX MacPython'
 if sys.platform == "os2emx":
     raise TestFailed, "OS/2+EMX port has malloc problems with long expressions"
 else: