You were suffering from the well known slow browsing
problem where only the Konqueror browser is fast enough to
work. Sometimes this can be cured by entering the DNS
name server IP addresses into resolv.conf. Sometimes it
can be cured by turning off IPv6. Another way to solve the
problem is to update the software in your wireless router.
Different solutions work for different people.
For me entering the DNS nameservers didn't work. Turning
off IPv6 support did work but I also found that after I
upgraded the software in my Dlink router I could leave
IPv6 on, not enter my DNS nameservers and everything
worked fine.