Re: Question about (excessive?) ram usage when many overlays (with large vscroll)

[dalanicolai <dalanicolai@gmail.com>]

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Thanks Po! Indeed, I was not aware of that (I couldn't find anywhere what
vscroll means 'exactly',
i.e. I did not know it was 'relative w.r.t. the 'current point').
Anyway, indeed doing what you suggested works great (i.e. fast scrolling
and no issue with the
large memory). Too bad I have to rewrite substantial parts of image-roll.el
again, but after that I
think it will finally provide a quite nice 'image-roll'.

On Tue, 26 Apr 2022 at 14:49, Po Lu <luangruo@yahoo.com> wrote:

> dalanicolai <dalanicolai@gmail.com> writes:
>
> > So I have created `image-roll.el` for displaying documents/books (see
> > here).  However, I have just noticed that it uses a large amount of
> > RAM when viewing (or trying to) pages in the back of 'large'
> > books. But even if RAM usage still looks perfectly fine, Emacs crashes
> > when trying to scroll to higher page numbers.
>
> I didn't try to reproduce this problem, but note that it's slow to
> vscroll large amounts of text.  Instead, find the start of the first
> line that will be visible onscreen (using window-text-pixel-size or
> posn-at-point), make that the window start, and set vscroll starting
> from there instead.
>

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