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Re: Performance degradation from long lines

From: Stefan Kangas
Subject: Re: Performance degradation from long lines
Date: Sat, 13 Jul 2019 11:07:08 +0200

Eli Zaretskii <address@hidden> writes:

> One comment I have is that disabling bidi-display-reordering should
> probably be removed from the defaults, because doing so puts the
> display engine in a state that is not being tested, and can cause
> inconsistencies and even bugs (because some portions of the code were
> written under the assumption that this variable is never nil).

I think some users are already setting bidi-display-reordering to nil.  I
stumbled into this the other day, for example:

    You can try and see if setting bidi-display-reordering to nil
improves the speed
    for you. This removes one significant contributor to line scans,
but sadly not
    the only one.


Should Emacs support that?  Should it be added to its doc string that it could
be dangerous?

Stefan Kangas

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