[ubuntu] Sluggish internet connectivity

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http://ubuntuforums.org – I'm using Ubuntu 10.10 32-bit desktop version and connecting to the Internet by a wire connection. I use firefox as my main browser but tried other browsers as well but they all seem to load whenever they want. I've read other threads which suggested disabling IPv6 which I did for firebox browser and for the system. Problem: I find myself constantly refreshing a page just to load up and if it doesn't it just hangs at "waiting...." OR "transfering...". Similarly, youtube videos tend to just stop loading half-way through, or my internet radio stream just stops till I refresh (HowTos)