The monitoring logic for VM usage seems odd, or not accurate enough. I did some simple testing and here are my guesses
The displayed network traffic may be the sum of traffic generated between refresh intervals. The default refresh interval is 3 seconds, and when my gigabit network is fully utilized, the Net RX/TX in Openwrt VM Usage shows around 360MB/s. Dividing 360 by 3 gives 120MB/s, approximately the limit of a gigabit network.
When I change the refresh interval to 1 second, the fully utilized gigabit network shows around 120MB/s, which aligns with the common understanding of "network speed."
The following figure shows the network usage during my speed test.
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