Does anyone know what this connection is? I set up iCloud Drive, and now my network gets bogged down trying to connect to this server and uploading a whole lot of data to it. Its so bad my Apple TV can't connect to netflix and all other computers slow down.
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File uploads will usually choke up a local network, you'd have to find a way to throttle your uploads to prevent this. Some routers have QoS controls that allow you to lower your upload rate, even just limiting it a little will free up enough bandwidth for other devices. If it's your Mac doing the uploading, you can do this on the system:
http://apple.stackexchange.com/questions/112329/limit-my-upload-speed-at-os-level