Browsing Hangs After Site Comes Onto Domain

We have a branch office that we just added to our domain and once we added them users started to complain about internet pages that hang then crash. It is intermentent but it happens enough to raise large concern. The site has a 2008 server for DC and a brand new sonicwall. How would I begin to troubleshoot something like this?
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SandeshdubeySenior Server EngineerCommented:
Ensuer that correct dns setting is set on DCS and clients as this

Verify the health of new dc by dcdiag /q and repadmin /replsum and post the log.Check the event log on DC and clients for any errors and warning and post the same.Ensure that firewall is not causing the issue,you can run network trace to check the same.

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