[JimRoepcke]

It is if you're using Safari. I have two M1 Max MBPs. My personal machine runs Chrome, and my work machine runs Safari. I can run my work machine for well over a day doing iOS development in Xcode with an external monitor attached and not run out of battery. The personal machine will last almost all day (without a monitor attached) but not quite. I'm sure if I used Safari it would last much longer.

[justapassenger]

I've tried both. Safari does some neat tricks to reduce usage when pages are not active. But if you have a heavy webapp - you have a heavy webapp, and power will be used.