Fortunately, I've never had it that bad, but on both laptops I've owned, I've run leaders on Medium render, just to be safe. The machine definitely adapts over time, getting rid of (most) of the awkward highlighted-gray hairs and other weird physics, but I definitely wish I could run it as smooth as in the first look videos.
It's odd. Certain leaders with a high level of detail run beautifully smooth on my hardware (Montezuma, Tomyris) and some are horribly laggy (good old Joao above, it's probably his coat). The ones with simple detail/few moving parts are usually alright, but for some dang reason Lautaro just can't for me. Poor dude blinks like a lizard, one eyelid leading the other, and moves like every other in-between frame is missing.