Originally Posted by Wasgij
9 times out of 10 if you have a latency issue you are getting Line noise from your ISP .
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This is not true. There are more than several issues that can cause high latency. Physical location from the server aside.
Wireless connection (not officially supported by Blizzard)
Bad router.
Bad modem.
Bad client side cables.
Corrupt or outdated client side firmware.
In order from your connection to the game server: Isp issues, ISP peering partner issues, or AT&T (Blizz ISP) issues.
Sometimes I have the same problem that Xrystal has... if my roomie or daughter is downloading something large it will cause me to have higher latency in game. I've spoke to several networking admins about how I have all the computers connected to the net, and this should definitely not be happening. There's something set up wrong somewhere, but it doesn't happen often enough for me to bother tracking it down.