Well, I have not tried it yet, but you can give it pleasure -
In IIS7, select the server and open the Configuration Editor . In the right panel there is the ability to search for a configuration. We are looking for webLimits here.
It could be the key. More information on webLimits can be found here.
EDIT - I found this attribute for webLimits that should help:
maxGlobalBandwidth - indicates the maximum total throughput for the server. Setting the value to 0 allows you to use unlimited bandwidth for the server. The default value is 4294967295.
Arpit
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