1.)

Download Cablenut by clicking here. 


2.) Install CableNut, restart PC after installation.


3.) Test your speed here at testmy.net
 
      Note your Download and Upload speeds.


4.) Note your download, upload values in Kbps & latency value in ms (milliseconds).

** To know your latency, open Command Prompt (start menu/run/type cmd/enter).
In the command prompt type ping testmy.net and hit enter. Your latency is the "Approximate roundtrip times in milli-seconds Average".
However, it is just fine if you may want to get the maximum latency value.


5.) Go to
http://www.j79zlr.com/cablenutXP2k.php, don't forget to choose your connection carefully, then put your download, upload & latency values in the box provided.


6.) Click "Compute Settings"


7.) Click "CCS File Download", save the file to your desktop.


8.) Go back to
http://www.j79zlr.com/cablenutXP2k.php


9.) Click TCP/IP Analyzer


10.) Know your TCP Receive Window (RWIN) values, write down the values for "scale factor of 8" and "scale factor of 4".


11.) Now, download the latest version of CCleaner by clicking here.
 

12.) Install CCleaner, Analyze and Run Cleaner to eliminate all unwanted and junk files in your HD.


13.) Now open Command Prompt, type ipconfig /flushdns.


14.) Exit Command Prompt.


15.) Open the CableNut setting you saved on your desktop.


16.) In the "DefaultReceiveWindow" box, change the current value to the value you wrote for "scale factor of 8"


17.) In the "DefaultSendWindow" box, change the current value to the value you wrote for "scale factor of 4"


18.) Important, see to it that the value for TCPMaxHalfOpen = 100, MaxConnectionsPer1_0Server = 10 and MaxConnectionsPerServer = 10


19.) Click "Save to Registry", OK & Exit.


20.) Restart PC

Your speed must be optimized now. Test your speed
http://www.testmy.net/tools/test/d_load.php


Notes:
i. Smartbro's advertised speed is only 384 Kbps but this guide will give you almost twice that speed.
ii. This guide worked for some but might not work for others.
iii. Viruses, trojans, spywares, adwares, basestation downtime will surely affect speed tests.