On Thursday, 28 Dec 2017 at 04:04, Emanuel Berg wrote:

[...]

> From what I can understand from the manual
> entry, yanked last in this posts, the overview
> files are generated by Gnus only for nnml; for
> NNTP, the server makes them, so I suppose
> additions are communicated and
> appended locally.
>
> If so, deleting a file will help but eventually
> it will grow back to size.

Well, I deleted the .overview file and I was able to enter the group and
read the posts in it.  Memory usage went up only marginally.  Simple
enough to make a cron script or equivalent that deletes .overview files
that get too large, I guess.

I did first try setting nntp-nov-is-evil to t but this seemed to make
little difference.

Thanks for your help.

-- 
Eric S Fraga via Emacs 27.0.50, org 9.1.5