for Linux(masquerade gateway):

telnet proxy 8080
GET http://www.comicer.com HTTP/1.0


give slow speed(it is measure in a few BYTE/s).
while
telnet proxy 8080
CONNECT www.comicer.com HTTP/1.0
<some reply>
GET / HTTP/1.0


give full speed


but for windows(masquerade client)
telnet proxy 8080
GET http://www.comicer.com HTTP/1.0
and
CONNECT www.comicer.com HTTP/1.0
<some reply>
GET / HTTP/1.0

give fast speed.

wat happen?

using firefox or mozilla will result slow speed. Usually the page will only loaded partially. But so far www.comicer.com is only 1 I found. The rest website is ok.

Don't really know what's the problem, but I use a little script which gives a priority for certain sites, that's ip addresses:

#!/bin/bash

for i in "216.239.39.99" "80.65.162.90" "80.65.78.228" "195.222.50.78" "63.247.69.155" "67.19.58.194" \ "217.26.67.165" "207.68.172.246" "207.44.250.33" "80.65.78.230" "213.166.5.212"

do
iptables -t mangle -A OUTPUT -p tcp -d "$i/255.255.255.255" -j MARK --set-mark 3
iptables -t mangle -A OUTPUT -p tcp -d "$i/255.255.255.255" -j TOS --set-tos Minimize-Delay
done

so try to put instead of these ip addresses sites that load really slow. MAybe it will help.