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Sluggish Network

Sluggish Network

Sluggish Network

(OP)
The Setup:
 I have a small business network setup I'm working on with a D-Link DFL-80 separating the internal network from the T1 (which is split between two buildings upstream). On the DMZ side of the firewall, I'm running a server with 8 sites pushing an average of about 8-12 kilobits/second incoming data and probably at least five to ten times that outgoing. The Internal side has roughly 14 computers mainly talking amongst themselves (via a 24-port switch with one port as the uplink to the firewall) and occasionally accessing the internet.
  
 Problem/Question:
 Recently the network has been slowing drastically when accessing the internet from the internal network and the websites from a remote site. My first instincts point to maxing out the firewall's processing capabilities with so much traffic, but could it be pushing the limits of the half-T1? If it is the firewall, what would the next step up be? And if it's possibly the T1, is there anything that could be done about it? Lastly, regarding the 1.5Mb speed for a T1, is that half-duplex or full-duplex

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