What are decisive parts in a astrophotography dedicated laptop?

Astrophotography editing can consist of large amounts of images that get aligned and stacked (and stitched).
It is apparently very power demanding (myself laptop has big problems with is as it is).
So I’m looking for a new (or refurbished) one.
My question now is this:
In a computer, for this type of work, what is/are the decisive parts?
Is it the ram, the processor (speed), the video card?
Can someone enlighten me?

Thanks in advance!