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wireshark troubleshoot DNS issue

My company just upgraded my Internet connection to 10mb and it is still very slow. It is taking 4 seconds to load a page.
I have DNS running internally. I don't know if this is related to the DNS, the Internet connection, or the firewall.
Any tips on troubleshooting DNS issue with Wireshark?

2 Solutions
You're running DNS internally? Through what exactly? If you're using something like Windows Server, you could try adjusting the forwarders. Why not just try statically setting your external DNS servers to those of another provider? For example, use Google's DNS servers ( is one of them) or Level 3's servers ( is one of theirs). If things are suddenly responding faster, then there's your problem. What type of equipment are you using at your location?

I know, this does not address the usage of Wireshark, but this is a case where you may not necessarily need to.
1:Check speedtest.net web site to see if you actually getting 10Mb or not.

2:Even if your download speed is 10Mb you may lag during initial connection , ping a famous website :

Go go command (Cmd) and type pinf google.com. If your connection is good then the round trip times should be a very small number(not more than 10-15 milli-seconds)

For me I have:

Ping statistics for
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 1ms, Average = 1ms
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