Your best bet would be to enable netflow on the interface ingress and configure top talkers.
TXLoad is the amount of traffic being transmitted from your interface and the RXLoad is the amount of traffic received on the interface. Your rxload is 80/255 which is about 31% utilization of your total bandwidth inbound.
Top talkers will tell you what port and source/destination address is being used. If your router supports it you'll probably want to configure it so you can see what the traffic is fairly easy:
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Txload and rxload are just another way to show your average utilization, i.e.:
txload 6/255 = 2.35%
rxload 80/255 = 31.37%
input rate 389 (K) / 1236 Kbps = 31.47%
output rate 33 (K) / 1236 Kbps = 2.66%
Both of these are based on a 5 minute average (the default).
As to why your network is "dead slow", not enough information to hazard a guess.
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