WEBRTC Webrtc is used for online streaming for f.ex. online phone calls. For some reason, when a page that is using that protocol, even in stand-by, forces the frequency of the CPU of the macbook to max levels. Here is the example of what I mean. Half of the graph the WEBRTC containing website is open.

So when you have connected both the external monitor that uses the discrete GPU – AND use some website that utilizes the WEBRTC protocol, even in stendby, you will get fans spinning and high temperatures. Battery is also drained substantially faster than when using just f.ex. youtube. Youtube playback in 1080p uses 10% of what WEBRTP uses in standby mode.
1 HOUR SKYPE MEETING DRAINS ENTIRE MACBOOK BATTERY. 1 HOUR OF HANGOUTS MEETING DRAINS ENTIRE MACBOOK BATTERY.
When one of the keyboard buttons break, need to replace entire topcase, which costs around 500 USD.