GitHub user shakibshalim74 closed the discussion with a comment: Need help with 
network rate limit

In our current CloudStack environment (Version: 4.19.3.0), the global settings 
are configured as follows:

1. Network Offerings: 200 MB (cloud.network_offerings)
2. System VM Service Offerings: 200 MB (cloud.service_offering)

We have also created a compute offering with 2000 MHz CPU and set the Network 
Rate to 2000 MB. Using this offering, we launched several Windows and Linux 
VMs, which work correctly and achieve up to 1 Gbps network bandwidth.

However, we encounter an issue when attaching a Windows VM NIC with VirtIO. In 
this case, the VM cannot exceed a 200 MB network limit, whereas the same VM 
without the VirtIO driver works as expected and achieves the full bandwidth.

GitHub link: 
https://github.com/apache/cloudstack/discussions/11600#discussioncomment-14997238

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