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Why do custom visuals need a network connection?
Try this. 1) Create a PowerBI desktop document with at least 1 custom visualization. 2) Save it. 3) Close PowerBI. 4) Turn-off your network connection. 5) Launch the previously created PowerB...
Hmm, I wonder if it is not that custom visuals necessarily require an Internet connection but that a lot of custom visuals utilize external libraries like JQuery, etc. that are perhaps referenced versus embedded in the code?
From what I understand the custom visuals need to talk to the Power BI APIs in order for them to render. And based on what you detailed below it would work out perfectly as to what you explained with no internet connection.
It would appear that it is by design for Custom Visuals to have an internet connection. This is just what I have experienced with Custom Visuals, where I know in the past at times some have taken a while to load, and the explanation from Microsoft was due to it communicating with the Power BI APIs