If you are experiencing lag,

a) first thing you need to check is your internet, try to connect your computer to internet with ethernet cable instead of Wi-Fi

b) check if anyone is sharing your internet or if your bit comet is download something in the background, and restart your router/modem to reset the traffic. 

If these don't work, then you can try the following steps.

Method 1:

a) go www.speedtest.net to check your upload and download speed, see if the speed is stable

b) type cmd in Windows Find,  in cmd type "ping www.google.com -t"  and see if the ping is stable and any packet loss.  If the ping keep jumping a lot/there are packet loss, it means your internet is unstable, reset your router, stop sharing your internet with others, and contact your ISP(internet service provider)

c) If the aboves all seems fine, you can send us a support ticket tell us your country and city. Download Teamviewer so we can analyze the problem for you  https://www.teamviewer.com/

Method 2:

TCP no delay, which is basically an optimization of network traffic that tries to reduce overall packet volume but can cause extra latency in the connection. This should work on Windows 7 or Vista, though the same principle can probably applied to other operating systems as well.

1.       From a command prompt (usually in All Programs -> Accessories -> Command Prompt) run “regedit”

2.       Browse to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces

3.       Browse the items under interfaces until you find one that has an IPAddress entry matching the network interface you want to affect (typically LAN IP addresses start with 192.168 or 10.0); note that if your IP address is automatically assigned by a DHCP server you may need to look for a matching DhcpIPAddress instead of IPAddress

4.       Right-click on the interface and select New > DWORD (32-bit) Value, name it “TcpAckFrequency”

5.       Right-click the new TcpAckFrequency value and select Modify, enter “1″ (Hexadecimal radio button should be selected)

6.      Right-click on the interface and select New > DWORD (32-bit) Value, name it “TCPNoDelay” (note that TCP is all uppercase this time – that’s intentional)

7.       Right-click the new TCPNoDelay value and select Modify, enter “1″ (Hexadecimal radio button should be selected)

8.      Verify that both TcpAckFrequency and TCPNoDelay now show up in the adapter’s property list with types REG_DWORD and values 0×00000001

9.      Exit regedit and reboot (reboot is necessary for the changes to take effect!)

Play a game and enjoy your new low ping