It's been true for a while on Windows, going back to IE9: https://blogs.msdn.microsoft.com/ie/2011/03/28/browser-power-consumptionleading-the-industry-with-inte

It's been true for a while on Windows, going back to IE9: https://blogs.msdn.microsoft.com/ie/2011/03/28/browser-power-consumptionleading-the-industry-with-internet-explorer-9/ https://blogs.msdn.microsoft.com/ie/2011/03/28/browser-power...