Merge pull request #2337 from edx/dhm/bug_perf_loc

Dhm/bug perf loc

cms/envs/aws.py

@@ -122,6 +122,13 @@ SITE_NAME = ENV_TOKENS['SITE_NAME']
 LOG_DIR = ENV_TOKENS['LOG_DIR']
 
 CACHES = ENV_TOKENS['CACHES']
+# Cache used for location mapping -- called many times with the same key/value
+# in a given request.
+if 'loc_cache' not in CACHES:
+    CACHES['loc_cache'] = {
+        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+        'LOCATION': 'edx_location_mem_cache',
+    }
 
 SESSION_COOKIE_DOMAIN = ENV_TOKENS.get('SESSION_COOKIE_DOMAIN')
 SESSION_ENGINE = ENV_TOKENS.get('SESSION_ENGINE', SESSION_ENGINE)