User log in bogging down network - How to QOS / Bandwidth per computer

Hi,
I am working with a slow network (100mbs), we are having an issue were one user has a large profile and when that user logs in onto a new computer it almost halts the network.
The obvious solution it to install a 1GB switch, which I am going to do but...
This company is rapidly growing and it wont be long before there are several users with large profiles logging in simultaneously.
I would like to implement some sort of QoS policy where each computers connection to the server is limited to a max of say 100mb.
Can this be done with built in GPO's or Free Software.
The site is running a single server 2012 domain controller. that is also the file server.
Thanks in advanced for any help you can give.
Cheers

Hi,
>>Can this be done with built in GPO's or Free Software
Before going further, we can use GPO to configure policy-based QoS to manage network traffic.
Regarding this point, the following articles can be referred to as reference.
Policy-based Quality of Service (QoS)
https://technet.microsoft.com/en-us/library/jj159288.aspx
Configuring Policy-based Quality of Service (QoS)
https://technet.microsoft.com/en-us/library/hh831689.aspx
>>The obvious solution it to install a 1GB switch, which I am going to do but...
Based on the description, I do agree that this should be the way to go.
Best regards,
Frank Shen
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