Ipv6? Firefox fast but all the rest slow

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http://forums.opensuse.org – Hi, I have a big issue which really goes on my nerves for weeks now but I can't find a solution for myself. The situation is this: In my openSuse11.2 system I have simply unacceptable internet perfomance which I can't observe in Windows7 on the same machine/network. I think it's mostly about ipv6. I found out that Firefox runs pretty nice when I set in about:config the option "network.dns.disableIPv6=true". this obviously has only an effect on Firefox. So how can I achieve the same for the complete system? I disabled ipv6 in the kernel. I verified that ifconfig shows no ipv6 information at all - but still - it must be something in the system which results into sluggish internet performance. I'm clueless :( grtx, \thomas (Distributions)