diff --git a/CHANGES.md b/CHANGES.md
index 73ae759..1146f16 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,6 @@
 ### 0.16.0 (2018-xx-xx xx:xx:xx UTC)
 
+* Change increase namecache size and fix deleting items from it when at capacity
 * Change improve security with cross-site request forgery (xsrf) protection on web forms
 * Change improve security by sending header flags httponly and secure with cookies
 * Change improve security with DNS rebinding prevention, set "Allowed browser hostnames" at config/General/Web Interface
diff --git a/sickbeard/classes.py b/sickbeard/classes.py
index aef64b9..9ea85d8 100644
--- a/sickbeard/classes.py
+++ b/sickbeard/classes.py
@@ -15,18 +15,16 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with SickGear.  If not, see <http://www.gnu.org/licenses/>.
-import re
-import datetime
-import os
+from collections import OrderedDict
 
-import sickbeard
 from sickbeard.common import Quality
 from unidecode import unidecode
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from requests.compat import OrderedDict
+import datetime
+import os
+import re
+
+import sickbeard
 
 
 class SearchResult(object):
@@ -343,6 +341,35 @@ class OrderedDefaultdict(OrderedDict):
         args = (self.default_factory,) if self.default_factory else ()
         return self.__class__, args, None, None, self.iteritems()
 
+    # backport from python 3
+    def move_to_end(self, key, last=True):
+        """Move an existing element to the end (or beginning if last==False).
+
+        Raises KeyError if the element does not exist.
+        When last=True, acts like a fast version of self[key]=self.pop(key).
+
+        """
+        link_prev, link_next, key = link = self._OrderedDict__map[key]
+        link_prev[1] = link_next
+        link_next[0] = link_prev
+        root = self._OrderedDict__root
+        if last:
+            last = root[0]
+            link[0] = last
+            link[1] = root
+            last[1] = root[0] = link
+        else:
+            first = root[1]
+            link[0] = root
+            link[1] = first
+            root[1] = first[0] = link
+
+    def first_key(self):
+        return self._OrderedDict__root[1][2]
+
+    def last_key(self):
+        return self._OrderedDict__root[0][2]
+
 
 class ImageUrlList(list):
     def __init__(self, max_age=30):
diff --git a/sickbeard/databases/cache_db.py b/sickbeard/databases/cache_db.py
index de3dc25..a890f43 100644
--- a/sickbeard/databases/cache_db.py
+++ b/sickbeard/databases/cache_db.py
@@ -16,8 +16,9 @@
 # You should have received a copy of the GNU General Public License
 # along with SickGear.  If not, see <http://www.gnu.org/licenses/>.
 
-from sickbeard import db
 from collections import OrderedDict
+from sickbeard import db
+
 import re
 
 MIN_DB_VERSION = 1
diff --git a/sickbeard/name_parser/parser.py b/sickbeard/name_parser/parser.py
index 97209c5..7fabdfa 100644
--- a/sickbeard/name_parser/parser.py
+++ b/sickbeard/name_parser/parser.py
@@ -23,6 +23,7 @@ import os
 import os.path
 import re
 import time
+import threading
 
 import regexes
 import sickbeard
@@ -35,6 +36,7 @@ except ImportError:
 
 from sickbeard import logger, helpers, scene_numbering, common, scene_exceptions, encodingKludge as ek, db
 from sickbeard.exceptions import ex
+from sickbeard.classes import OrderedDefaultdict
 
 
 class NameParser(object):
@@ -706,20 +708,31 @@ class ParseResult(object):
 
 
 class NameParserCache(object):
-    _previous_parsed = {}
-    _cache_size = 100
+    def __init__(self):
+        super(NameParserCache, self).__init__()
+        self._previous_parsed = OrderedDefaultdict()
+        self._cache_size = 1000
+        self.lock = threading.Lock()
 
     def add(self, name, parse_result):
-        self._previous_parsed[name] = parse_result
-        _current_cache_size = len(self._previous_parsed)
-        if _current_cache_size > self._cache_size:
-            for i in range(_current_cache_size - self._cache_size):
-                del self._previous_parsed[self._previous_parsed.keys()[0]]
+        with self.lock:
+            self._previous_parsed[name] = parse_result
+            _current_cache_size = len(self._previous_parsed)
+            if _current_cache_size > self._cache_size:
+                key = None
+                for i in range(_current_cache_size - self._cache_size):
+                    try:
+                        key = self._previous_parsed.first_key()
+                        del self._previous_parsed[key]
+                    except KeyError:
+                        logger.log('Could not remove old NameParserCache entry: %s' % key, logger.DEBUG)
 
     def get(self, name):
-        if name in self._previous_parsed:
-            logger.log('Using cached parse result for: ' + name, logger.DEBUG)
-            return self._previous_parsed[name]
+        with self.lock:
+            if name in self._previous_parsed:
+                logger.log('Using cached parse result for: ' + name, logger.DEBUG)
+                self._previous_parsed.move_to_end(name)
+                return self._previous_parsed[name]
 
 
 name_parser_cache = NameParserCache()
diff --git a/sickbeard/providers/blutopia.py b/sickbeard/providers/blutopia.py
index 5639c93..69bfe25 100644
--- a/sickbeard/providers/blutopia.py
+++ b/sickbeard/providers/blutopia.py
@@ -15,10 +15,8 @@
 # You should have received a copy of the GNU General Public License
 # along with SickGear.  If not, see <http://www.gnu.org/licenses/>.
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from requests.compat import OrderedDict
+from collections import OrderedDict
+
 import re
 import traceback
 
diff --git a/sickbeard/providers/fano.py b/sickbeard/providers/fano.py
index a1e9489..d3ef039 100644
--- a/sickbeard/providers/fano.py
+++ b/sickbeard/providers/fano.py
@@ -15,10 +15,8 @@
 # You should have received a copy of the GNU General Public License
 # along with SickGear.  If not, see <http://www.gnu.org/licenses/>.
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from requests.compat import OrderedDict
+from collections import OrderedDict
+
 import re
 import traceback
 
diff --git a/sickbeard/providers/hdspace.py b/sickbeard/providers/hdspace.py
index f6e63ff..9df1261 100644
--- a/sickbeard/providers/hdspace.py
+++ b/sickbeard/providers/hdspace.py
@@ -15,10 +15,8 @@
 # You should have received a copy of the GNU General Public License
 # along with SickGear.  If not, see <http://www.gnu.org/licenses/>.
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from requests.compat import OrderedDict
+from collections import OrderedDict
+
 import re
 import traceback
 
diff --git a/sickbeard/providers/hdtorrents.py b/sickbeard/providers/hdtorrents.py
index ec8049d..0c8e738 100644
--- a/sickbeard/providers/hdtorrents.py
+++ b/sickbeard/providers/hdtorrents.py
@@ -15,10 +15,8 @@
 # You should have received a copy of the GNU General Public License
 # along with SickGear.  If not, see <http://www.gnu.org/licenses/>.
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from requests.compat import OrderedDict
+from collections import OrderedDict
+
 import re
 import traceback
 
diff --git a/sickbeard/providers/newznab.py b/sickbeard/providers/newznab.py
index 664ea21..2024572 100755
--- a/sickbeard/providers/newznab.py
+++ b/sickbeard/providers/newznab.py
@@ -17,26 +17,28 @@
 # along with SickGear.  If not, see <http://www.gnu.org/licenses/>.
 
 from __future__ import division
+from collections import OrderedDict
+from math import ceil
 
-import time
-import sickbeard
 import datetime
 import re
+import time
 import urllib
-from math import ceil
 
-from sickbeard.sbdatetime import sbdatetime
+import sickbeard
+
+from io import BytesIO
+from lib.dateutil import parser
 from . import generic
-from sickbeard import helpers, logger, tvcache, classes, db
-from sickbeard.common import neededQualities, Quality, SNATCHED, SNATCHED_PROPER, SNATCHED_BEST, DOWNLOADED
+from sickbeard import classes, db, helpers, logger, tvcache
+from sickbeard.common import neededQualities, Quality, DOWNLOADED, SNATCHED, SNATCHED_PROPER, SNATCHED_BEST
 from sickbeard.exceptions import AuthException, MultipleShowObjectsException
+from sickbeard.helpers import tryInt
 from sickbeard.indexers.indexer_config import *
-from io import BytesIO
-from lib.dateutil import parser
 from sickbeard.network_timezones import sb_timezone
-from sickbeard.helpers import tryInt
+from sickbeard.sbdatetime import sbdatetime
+from sickbeard.search import get_aired_in_season, get_wanted_qualities
 from sickbeard.show_name_helpers import get_show_names
-from sickbeard.search import get_wanted_qualities, get_aired_in_season
 
 try:
     from lxml import etree
@@ -46,11 +48,6 @@ except ImportError:
     except ImportError:
         import xml.etree.ElementTree as etree
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from requests.compat import OrderedDict
-
 
 class NewznabConstants:
     SEARCH_TEXT = -100
@@ -73,7 +70,7 @@ class NewznabConstants:
                         r'^BoxHD$': CAT_HD,
                         r'^UHD$': CAT_UHD,
                         r'^4K$': CAT_UHD,
-                        #r'^HEVC$': CAT_HEVC,
+                        # r'^HEVC$': CAT_HEVC,
                         r'^WEB.?DL$': CAT_WEBDL}
 
     providerToIndexerMapping = {'tvdbid': INDEXER_TVDB,
@@ -101,8 +98,8 @@ class NewznabConstants:
 
 class NewznabProvider(generic.NZBProvider):
 
-    def __init__(self, name, url, key='', cat_ids=None, search_mode=None,
-                 search_fallback=False, enable_recentsearch=False, enable_backlog=False, enable_scheduled_backlog=False):
+    def __init__(self, name, url, key='', cat_ids=None, search_mode=None, search_fallback=False,
+                 enable_recentsearch=False, enable_backlog=False, enable_scheduled_backlog=False):
         generic.NZBProvider.__init__(self, name, True, False)
 
         self.url = url
@@ -235,8 +232,8 @@ class NewznabProvider(generic.NZBProvider):
 
             limit = xml_caps.find('.//limits')
             if None is not limit:
-                l = helpers.tryInt(limit.get('max'), 100)
-                self._limits = (100, l)[l >= 100]
+                lim = helpers.tryInt(limit.get('max'), 100)
+                self._limits = (100, lim)[lim >= 100]
 
             try:
                 for category in xml_caps.iter('category'):
diff --git a/sickbeard/providers/privatehd.py b/sickbeard/providers/privatehd.py
index 5360b0c..86f8080 100644
--- a/sickbeard/providers/privatehd.py
+++ b/sickbeard/providers/privatehd.py
@@ -15,10 +15,8 @@
 # You should have received a copy of the GNU General Public License
 # along with SickGear.  If not, see <http://www.gnu.org/licenses/>.
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from requests.compat import OrderedDict
+from collections import OrderedDict
+
 import re
 import traceback
 
diff --git a/sickbeard/providers/ptf.py b/sickbeard/providers/ptf.py
index 9a76c18..d59c644 100644
--- a/sickbeard/providers/ptf.py
+++ b/sickbeard/providers/ptf.py
@@ -15,10 +15,8 @@
 # You should have received a copy of the GNU General Public License
 # along with SickGear.  If not, see <http://www.gnu.org/licenses/>.
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from requests.compat import OrderedDict
+from collections import OrderedDict
+
 import re
 import time
 import traceback