Currently it appears to be setup that all layers will load even if they aren't currently enabled. While this makes it faster in the event you need to turn a layer on/off rapidly, it results in a lot more network bandwidth usage as all layers load even if they aren't enabled.
OK, I think this is fixed now. Still need to finish testing, but layers that are unchecked shouldn't load. And if you uncheck them one time, they shouldn't load next time.
Currently it appears to be setup that all layers will load even if they aren't currently enabled. While this makes it faster in the event you need to turn a layer on/off rapidly, it results in a lot more network bandwidth usage as all layers load even if they aren't enabled.