Cause of reduction of speed of a shared Internet connection

We are using a dedicated line for the Internet connection with a speed of 64MBps. The network has 36 computers. The Internet speed when all computers are connected is very low. We wanted to know the real cause of the reduction of the speed. Some are saying it is because of chat room, others are saying it is because of downloads, others, because of email sites. What is the real cause?
chriskaAsked:
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haossCommented:
all actions on internet slows the link. also the mail if you are use from internet.
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Adrian DobrotaNetworking EngineerCommented:
You can install on the server a free software as ethereal is (find it at http://www.ethereal.com/download.html ) and analyze traffic.
Usually downloads are using most of the bandwidth , not mails or chats. Also video streaming (are u using any video conferencing software or VOIP gateways?)
Also some viruses "eat" a lot of your bandwidth , so check carefully

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lrmooreCommented:
A 64k connection just isn't very much to start with and it won't take much to slow it down. If it is a Cisco router at the connection,  you can turn on ip accounting and find out who's taking up all the bandwidth.
Generally speaking, the lastest MSBLAST and Welchia/Nachia worms cause these exact symptoms due to the extreme amount of scan traffic they send out.
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