diff --git a/plugins/ContentFilter/ContentFilterPlugin.py b/plugins/ContentFilter/ContentFilterPlugin.py
index da1054b1..4d5d1b4c 100644
--- a/plugins/ContentFilter/ContentFilterPlugin.py
+++ b/plugins/ContentFilter/ContentFilterPlugin.py
@@ -198,8 +198,8 @@ class UiRequestPlugin(object):
         if self.server.site_manager.get(address):  # Site already exists
             return super(UiRequestPlugin, self).actionWrapper(path, extra_headers)
 
-        if self.server.site_manager.isDomain(address):
-            address = self.server.site_manager.resolveDomain(address)
+        if self.isDomain(address):
+            address = self.resolveDomain(address)
 
         if address:
             address_sha256 = "0x" + hashlib.sha256(address.encode("utf8")).hexdigest()
diff --git a/src/Site/SiteManager.py b/src/Site/SiteManager.py
index 2de98dce..9c33d8b7 100644
--- a/src/Site/SiteManager.py
+++ b/src/Site/SiteManager.py
@@ -12,6 +12,7 @@ from Content import ContentDb
 from Config import config
 from util import helper
 from util import RateLimit
+from util import Cached
 
 
 @PluginManager.acceptPlugins
@@ -135,13 +136,21 @@ class SiteManager(object):
     def isDomain(self, address):
         return False
 
+    @Cached(timeout=10)
+    def isDomainCached(self, address):
+        return self.isDomain(address)
+
     def resolveDomain(self, domain):
         return False
 
+    @Cached(timeout=10)
+    def resolveDomainCached(self, domain):
+        return self.resolveDomain(domain)
+
     # Return: Site object or None if not found
     def get(self, address):
-        if self.isDomain(address):
-            address_resolved = self.resolveDomain(address)
+        if self.isDomainCached(address):
+            address_resolved = self.resolveDomainCached(address)
             if address_resolved:
                 address = address_resolved
 
@@ -175,8 +184,8 @@ class SiteManager(object):
 
     # Return or create site and start download site files
     def need(self, address, all_file=True, settings=None):
-        if self.isDomain(address):
-            address_resolved = self.resolveDomain(address)
+        if self.isDomainCached(address):
+            address_resolved = self.resolveDomainCached(address)
             if address_resolved:
                 address = address_resolved
 
diff --git a/src/Ui/UiRequest.py b/src/Ui/UiRequest.py
index 9f14882e..2aa87af2 100644
--- a/src/Ui/UiRequest.py
+++ b/src/Ui/UiRequest.py
@@ -69,13 +69,19 @@ class UiRequest(object):
             return True
 
         if self.isProxyRequest():  # Support for chrome extension proxy
-            if self.server.site_manager.isDomain(host):
+            if self.isDomain(host):
                 return True
             else:
                 return False
 
         return False
 
+    def isDomain(self, address):
+        return self.server.site_manager.isDomainCached(address)
+
+    def resolveDomain(self, domain):
+        return self.server.site_manager.resolveDomainCached(domain)
+
     # Call the request handler function base on path
     def route(self, path):
         # Restict Ui access by ip
@@ -96,7 +102,7 @@ class UiRequest(object):
             return iter([ret_error, ret_link])
 
         # Prepend .bit host for transparent proxy
-        if self.server.site_manager.isDomain(self.env.get("HTTP_HOST")):
+        if self.isDomain(self.env.get("HTTP_HOST")):
             path = re.sub("^/", "/" + self.env.get("HTTP_HOST") + "/", path)
         path = re.sub("^http://zero[/]+", "/", path)  # Remove begining http://zero/ for chrome extension
         path = re.sub("^http://", "/", path)  # Remove begining http for chrome extension .bit access
@@ -173,7 +179,7 @@ class UiRequest(object):
 
     # The request is proxied by chrome extension or a transparent proxy
     def isProxyRequest(self):
-        return self.env["PATH_INFO"].startswith("http://") or (self.server.allow_trans_proxy and self.server.site_manager.isDomain(self.env.get("HTTP_HOST")))
+        return self.env["PATH_INFO"].startswith("http://") or (self.server.allow_trans_proxy and self.isDomain(self.env.get("HTTP_HOST")))
 
     def isWebSocketRequest(self):
         return self.env.get("HTTP_UPGRADE") == "websocket"