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Information on 'Tweaking' your TCP stack

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Tweaks : Can you max out your connection speed?

Your PC may not be tuned properly to take full advantage your full connection speed. For those with high speed connections (faster cable networks, FiOS, etc), tuning your TCP stack is necessary if you wish to fully utilise the available bandwidth in one single download.

WINDOWS VISTA USERS: Vista TCP tuning (tweaking) is NOT advisable. The Vista TCP stack does a reasonable job of tuning the receive window dynamically, there are no known registry tweaks that would optimize Vista better than its default configuration.

Our tweak tester will monitor a test download and then suggest which settings you should modify, and why.
Tweaking may fix
Slow download speeds
Download slower than upload speed
Skipping in TCP streaming video/audio
Connection issues to some sites
Tweaking will not fix
Packet loss
Multiplayer games over UDP
Your ping time
PC freezes

Java Tweak Tool

Attention Satellite Users: DO NOT USE THIS TOOL - instead read the Satellite User FAQ on the subject of TWEAKING, also check out the Direcway Satellite Users Forum

«« No JAVA APPLET displayed? Please see FAQ entry 309: "the JAVA applets do not work"

«« BUSY? The tester is limited to certain maximum number of simultaneous tests at a time. It is also limited to 5 tests on one IP within a few hours.

The usual problem is that one or more PC 'security' programs (Zone Alarm PRO, Norton etc) are blocking this tool, and not alerting you. Disabling them should enable the test to function correctly.

Please make sure your browser can make requests to port 8085 and 8086. A firewall installed on your PC may block web requests to all ports except 80 and 443 without pop-up notification. This will halt the tweak test.