Focus on the comments you find most interesting.
Save time and go through a discussion breadth-first instead of depth-first. This avoids automatically getting caught by long threads and gives you an overview of different comments on a topic so that you can dive into the ones you find most interesting, for only as deep as you want.
Supports:
bikeshedding noun
: futile expenditure of time and energy in discussion of marginal technical issues
The following screenshots show a discussion on HN without this script, with this script, and with this script including the comments to the first comment, respectively.