Edge is very power efficient on Windows 10, assuming your drivers allow it to do full hardware acceleration. Their rendering stack and JS engine are very competitive.
It can be more efficent on Windows where Edge is first class passenger similar to how Safari is more efficient on MacOS. Try looking at battery life. You can easily squeeze more juice on Edge than on FF/Chrome.
There are significant changes in Edge compared to Chrome stable and perf and efficiency improvements on Windows (not to mention deeper system integration).
Edge has much better battery life than other browsers on Windows, much like Safari on Mac. Neither of those are the best browser, but when my choice is between six or ten hours of battery life, it's easy for me to decide.
I dream that one day Webkit / Blink will actually be efficient.
Why would cross-platform or developer tools be of any relevance when comparing energy efficiency while browsing the web on a Windows laptop? It's possible to use one browser when doing one task, and another browser when doing another. This article suggests that using Edge while consuming content on a battery powered computer would enable you to work longer, if you can do without the things you mentioned. Most people can.
I like edge because it uses less ram and uses less battery. I can run my VM without swapping like crazy and my laptop lasts almost twice as long on battery.
I have switched to Edge as my main browser for my laptop solely on that it does not drain my battery as fast as the others.
Edge has become much better since the last major update this spring, however still missing some functionality compared to the other browsers.
I think rendering performance Edge is already on par with it's competitors, I have no problems there. It is the application it self that has some annoyances, the "feeling" of the GUI. It can feel a bit laggy like when creating tabs, moving tabs etc. That needs more work.
My biggest gripe with Edge is that I can't change spell checking language without changing the keyboard layout for the Edge window.
I have no connection to Microsoft. I regularly use Edge, Firefox & Opera.
Edge's rendering engine is good. The only real problem Edge has is that they've built it using the ugly, unresponsive Metro UI. If they build a browser with the Chromium engine and a Metro UI, they can expect nobody to use it as well.
Edge is the most resource efficient and respects modern Windows conventions, therefore it has the best, pen, touchscreen, tablet (including share button and stuff) and precision trackpad support. And since it's WinRT/UWP, it can suspends its tab processes, and also itself when minimized or automatically during tablet mode in the background, and during fullscreen it also automatically unhides the taskbar when you hover over it, for better multi-tasking.
It also has nice features such as the set tabs aside session manager that even retains history and session cookies, and it a nice PDF and ePub reader with support for notes and highlighting with the pen, and Cortana integration. Before Edge, I primarily used Firefox and dabbled with Chrome and Vivaldi.
Edge is on both iOS and Android, and no I don't work for MS, I just value proper modern OS integration and battery efficiency, so that I can use my device as intended.
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