Trackdown website bottleneck

We've rolled out a new website.  Previous server had older website.  The new website has had performance issues, slowness etc.  Although it seems this is an issue with the new code I want to rule out any other possible issues.  

Current Internet line is 100 down / 11 up.  The Webserver is connected directly to a Sonicwall NSA 3500 on a 1000 Mbps full-duplex link.  

The Webserver is a physical server - ProLiant DL380p Gen8.  2 Xeon E5-2640 @ 2.5 GHz, 32 GB RAM, Smart Array P420i, Windows 2008 Std.,  2 1GB network cards teamed, 2 other unused.

Webserver is Apache.

I need to prove the server and connection it not the issue.  What is the best way to do that.
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dmwynneAsked:
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gheistCommented:
By monitoring network counters with e.g MRTG?
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gr8gonzoConsultantCommented:
What kind of code are you running? Is it connecting to a database? If so, what kind of database and is the database on the same server?
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dmwynneAuthor Commented:
It was a running a DB on the same server.
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