CTRL Elements is an online-only application, which means that it can only be used when connected to the internet. No requirements exist about the quality of the internet connection, although it should be noted that 3D models are downloaded from a server for the first time they are imported, so a poor connection can make model loading times very long. The quality and latency of the voice connection can also deteriorate from a bad connection.
The collaborative features (collaboratively editing scenes, seeing and talking to other users in VR) require the following UDP ports to be open:
5055, 5056, 5058, 27000-27002