It could very well be your DNS, you can change dns providers easy.
Service provider: Google
Google public dns server IP address:
* 8.8.8.8
* 8.8.4.4
=> Service provider
nsadvantage
Dnsadvantage free dns server list:
* 156.154.70.1
* 156.154.71.1
Service provider:OpenDNS
OpenDNS free dns server list / IP address:
* 208.67.222.222
* 208.67.220.220
Service provider:Norton
Norton free dns server list / IP address:
* 198.153.192.1
* 198.153.194.1
Service provider: GTEI DNS (now Verizon)
Public Name server IP address:
* 4.2.2.1
* 4.2.2.2
* 4.2.2.3
* 4.2.2.4
* 4.2.2.5
* 4.2.2.6
Service provider: ScrubIt
Public dns server address:
* 67.138.54.100
* 207.225.209.66
The fastest I have found is OpenDns, and if you change your router or computer to use OpenDns, it helps big time to filter out unwanted sites if you desire to.