I have a Thinkpad X1.
It struggles with just a few dozen tabs open. Opening a new Google doc takes ten seconds. And no, it isn’t out of memory; it’s just slow. The CPU isn’t maxed out, but I think the GPU is.
It’s hot, and the battery life is maybe three hours.
I also have an M1 MacBook. Under the same workload it’s cool to the touch, window switching is instant, opening a new doc takes maybe two seconds, and battery life is about eight hours.