Very angry to learn that TB is a cause of my second logic board to be fried by overheating from the Radeon GPU in my 2011 MBP. Even though I use the Preferences to NOT "use hardware acceleration when available" it sill forces the use of the killer GPU. Apple has a paper on how to do it right. See: https://developer.apple.com/library/archive/qa/qa1734/_index.html I just discovered an app that forces turning it off on all apps -- except that it does not work on all apps: https://gfx.io/switching.html#integrated-only-mode-limitations