Most websites seem unreasonable slow/down

gsrdgrdghd

Hey
I have the problem (well it exists since some months now) that most websites seem to open unreasonable slow in Firefox.
Sometimes a Google seach takes 10 seconds to complete, a Twitter profile 20 seconds to open and i'm lucky if any Facebook page opens at all.

Facebook seems to work nice in Chrome, but stuff like Twitter Profiles is still slow.
I'm not using a conventional router, but rather a Cisco EPC3208 cable modem with an Intel Little Falls 2 (2x1.6GHz Atom) as router/NAT (setup according to this tutorial: http://wiki.ubuntuusers.de/router theres probably also an english version of it)
After i upgraded Ubuntu (and dnsmasq, etc) to 11.10 most major sites stopped working on my housemate's PC, smaller ones still worked. That was fixed by reinstalling Windows so i assume my problems might also somehow be related to dnsmasq/the iptables NATting or Windows.

Things i can rule out as the cause of problems:
My internet connection ( http://www.speedtest.net/result/1714975808.png , http://www.pingtest.net/result/54817841.png )
Probably the connection between my router and my PC (using iperf (4 threads), i get 800 mbit). Im not really sure how to check for packet loss/weird stuff in my LAN tho.

Does anyone know this problem/a solution for it or a way i can perform some tests to isolate the problem?

gsrdgrdghd

Well i'm only running Ubuntu on the router (installed to a USB stick, Win 7 x64 Workstation) so browsers, wifi and sound aren't really concerns for me.

I ran mtr on my router but it seems to be fine. http://i.imgur.com/7MGtG.png
The major strange thing for me is that its only slow/doesn't work on some websites.

Is it possible that my PC tries to connect to the websites using IPv6 first or so?

Kairus

@gsrdgrdghd said: Is it possible that my PC tries to connect to the websites using IPv6 first or so?

Disable IPv6 in Windows?

gsrdgrdghd

@Kairus said: Disable IPv6 in Windows?

I tried that (just unticking IPv6 in the ethernet adapert config) but it didn't really help
For testing i ran a mtr against google.de, this is the result: http://i.imgur.com/tRasB.png

35% packet loss at the one hop doesn't seem really good.

And to www.facebook.com : http://i.imgur.com/6iEaM.png
Other europeans: Does your connection to Facebook also go all the way to the US?

ztec

@gsrdgrdghd said: Other europeans: Does your connection to Facebook also go all the way to the US?

Yes.