When I connect to game servers I usually do not have a bad ping, provided that automatic match making is not connecting me to a server in Australia, Japan or the US (I'm from Germany). That happens at times, both in Team Fortress 2 and in Counter Strike Global Offensive, the two games that I play the most currently. I do play a lot with friends and notice that their pings are usually a lot worse than mine. I used to attribute this solely to their Internet connection and did not really think that connection tweaks would change much in this regard.
Then I read about two Registry settings, TCPAckFrequency and TCPNoDelay, and how they can bring down the ping in games and other applications that work best with low latencies. If you are a gamer and experiencing lag issues when connected to a close-by server, you'd may want to try tweaking those two settings to see if this makes your gaming experience more enjoyable.
TCPAckFrequency "uses delayed acknowledgments to reduce the number of packets that are sent on the media". Instead of sending an acknowledgment each time, acknowledgments are delayed.
TCPNoDelay determines whether nagling is enabled or disabled. Nagling "is a feature that combines several packets into a single, larger packet for more efficient transmissions".
This reduces the overall load on the network to optimize network traffic. The drawback is that latency may increase because of it. If you are using your PC mostly for gaming, or experiencing issues with lag in games, then you may want to see if turning off those features improves gaming latency on your end.
You need to make two changes to your Windows Registry.
All that is left now is to reboot the PC, log off and on again, or kill and restart the explorer.exe process.
The effect depends a lot on the games you play, your Internet connection, and the servers you connect to. There have been reports by users who claimed that this reduced their ping times by 100ms and more in games they play.
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