Re: something like linum.el ought to be added

[David Kastrup <dak@gnu.org>]

Markus Triska <markus.triska@gmx.at> writes:

> Richard Stallman <rms@gnu.org> writes:
>
>> Is it efficient enough?
>
> Many users have reported good success, and it works well for me too.
> Please let me know if it doesn't work for you.
>
>> Preserving overlays on the other parts of the buffer won't things
>> speed up
>
> Since those overlays can be reused when re-visiting the parts of the
> buffer they were created for, this can speed things up since it avoids
> re-creation of overlays and intermediate garbage collection.

A large number of overlays is slowing down every operation in the
buffer.  Having a set of 50 or so that is only adjusted upon redraw
should be the fastest option for that reason.  If the overlay creation
is time-critical, one might move keep some off-screen overlays in a
separate list for reuse and detach them from the buffer temporarily.

But I doubt it would be worth the trouble.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum