I've all but confirmed that it's specifically the @linkedin web page (that I had kept pinned in my chrome-for-windows) which was chewing up about 40% of my battery life. I closed everything and re-opened all but that, still normal battery draw. Here is the site idle at CPU 15.6%!

the @linkedin tab seems to only be doing some network traffic while as a background tab, so it only occasionally is spiking the CPU, the rest of the time sitting at 0%.

but as soon as I activate the tab, its CPU jumps up to around 10%, and constantly bounces between 8 and 25%.

how could the site possibly be consuming 10-25% of my CPU at all times that the tab is active?

I mean, cliche, we say "oohhh, shitty JS and SPA sites". but no, like, seriously, how could you possibly be so poorly written to consume that much CPU?

the @linkedin site is built on ember... in fact a number of their core devs work there, and they're a primary incubator/supporter of the framework.

one would presume this site is built somewhat "to spec" of how an ember site should be.

if so, that's horrifying.

If I wrote a super naive framework that re-rendered the whole page constantly, churning the DOM and everything, causing tons of GC thrashing, etc.... I'm still not sure if I could get it to consistently kill 10-25% of the CPU, constantly, just never ending.

if I was like rendering the entire web page in webgl and rotated in 3d, re-rendered 60fps, and did everything I could to avoid being able to have GPU acceleration, I am not sure if I'd chew through 10-25% CPU.

I'm just sorta stunned. I never could have guessed/admitted/accepted that one single web page could be the culprit of my laptop having literally HALF it's advertised battery life... ~4-5 hours instead of 9-10.

here's the worst part... I actually really like @linkedin, and I use it quite often throughout my day. It's my secondary social network after this one.

I'm not shitting on it because I want to make fun of them. I'm genuinely sad that I can no longer justify having it open.

By contrast, I'm actively using twitter right now, installed PWA (chrome). I'm watching the chrome task manager, and seeing approx 1-3% CPU consistently being used while I'd writing these tweets.

Again, comparison was @linkedin just sitting there (idle foreground) at 10-25% CPU.