Re: Slow operations on buffers of tens of megabytes

[Katsumi Yamaoka]

>>>>> In <address@hidden> Richard Stallman wrote:

>     Scoring of the messages closer to the beginning of the buffer is fast,
>     but as we move to higher-numbered messages, that are closer to the end
>     of such big files/buffers, gnus will only score 2-3 messages per
>     minute, and that's what kills performance.

> Does Gnus make lots of overlays?  If so, maybe it needs to call
> overlay-recenter from time to time.  Could someone please try that
> and see if it makes things fast?

AFAIK, Gnus uses text properties here and there, but uses
overlays not so much.  The following one makes Gnus turn off
almost overlays:

(setq gnus-article-button-face nil
      gnus-signature-face nil
      gnus-summary-selected-face nil
      gnus-treat-highlight-citation nil
      gnus-treat-emphasize nil)

If it makes Gnus fast, improving the performance will be worth
trying.  However, I didn't feel any difference, though it might
be because I don't have huge mail folders.

Regards,