If you are experiencing slow VPN transfer speeds here are some common causes and fixes. 


Speedtest sites vary widely in results. We recommend trying several of them. Here are two popular ones. www.speedtest.net, www.scanmyspeed.com 

Always do a speed test with your Antivirus disabled. Many new antiviruses do sandboxing and can severly limit your VPN bandwidth. Microsoft Security Essentials, AVG and Kaspersky are known offenders but other ones do exist.


Speedtest Users Remember
It is very important that you test from a few different www.speedtest.net servers and not just the one it recommends. Lots of times the server it recommends might have good ping but are running too many speedtests and will not have the bandwidth needed to give you an accurate result.

Slow PPTP/L2TP Connections: 
  • Server overloaded or to far away. Try connecting to a closer server, from our clients server select menu select one with a low ping.
  • Your ISP or the network you are on might be limiting the speed of PPTP/L2TP connections (QoS). Try OpenVPN.
  • Someone else on your network at home/work may be downloading/uploading and hogging your bandwidth. Pull the plug from the back of there PC. Lecture them on being a good neighbor.
  • Your on Wifi or Powerline and there is network interference. Lower your MTU http://support.microsoft.com/kb/826159
  • Your device has a Killer Network card installed or some other software that is supposed to optimzie your network.  Test the connection with another machine or remove the network optimization software and test again.
  • There is a problem with the path to or from the server. While disconnected from the VPN go to https://cryptoip.info and write down your IP address. Connect to the VPN and Open a command prompt (start and type cmd) then enter tracert XXX.XXX.XXX.XXX (replace X's with the IP your got from https://cryptoip.info) then go to https://cryptoip.info again and write down the VPN IP. Disconnect from the VPN and from the command prompt type tracert XXX.XXX.XXX.XXX (this time replace the Xs with the IP of the VPN server) If you see numbers get suddenly high or show * you know it is most likely a problem with a network between you and the VPN server.

Slow OpenVPN Connections:

  • Server overloaded or to far away. Try connecting to a closer server, from our clients server select menu select one with a low ping.
  • You are using IP Modulation. IP Modulation can be slow. Use Shared or Public instead.
  • You are connecting via TCP. Try UDP.
  • You are connecting via UDP on a QoS port (ISPs QoS). Try different UDP ports
  • You are connecting via a home router (DDWRT/Netgear/Linksys etc) and getting 20Mbps or less. Try the connection from a PC.
  • Your device has a Killer Network card installed or some other software that is supposed to optimzie your network.  Test the connection with another machine or remove the network optimization software and test again.
  • Someone else on your network at home/work may be downloading/uploading and hogging your bandwidth. Pull the plug from the back of there PC. Lecture them on being a good neighbor.
  • Your device can't keep up with the encryption overhead. Your processor does not support AESNI (100mbit or higher broadband connections) Try PPTP/L2TP and do another speedtest.
  • You are on Wifi/Powerline and are experiencing packet fragmentation. Use the Config Generator with advanced option MSSFIX set to 1300
  • There is a problem with the path to or from the server.While disconnected from the VPN go to https://cryptoip.info and write down your IP address. Connect to the VPN and Open a command prompt (start and type cmd) then enter tracert XXX.XXX.XXX.XXX (replace X's with the IP your got from https://cryptoip.info) then go to https://cryptoip.info again and write down the VPN IP. Disconnect from the VPN and from the command prompt type tracert XXX.XXX.XXX.XXX (this time replace the Xs with the IP of the VPN server) If you see numbers get suddenly high or show * you know it is most likely a problem with a network between you and the VPN server.


If these solutions do not work then open a ticket at https://my.liquidvpn.com/submitticket.php 

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