GNU bug report logs - #26525
`sit-for' in Flyspell slows typing down, hogs 90% of CPU

Previous Next

Full log

Message #17 received at 26525 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Clément Pit-Claudel <cpitclaudel <at> gmail.com>
Cc: 26525 <at> debbugs.gnu.org
Subject: Re: bug#26525: `sit-for' in Flyspell slows typing down, hogs 90% of
 CPU
Date: Mon, 17 Apr 2017 17:25:30 +0300

> Cc: 26525 <at> debbugs.gnu.org
> From: Clément Pit-Claudel <cpitclaudel <at> gmail.com>
> Date: Mon, 17 Apr 2017 09:29:20 -0400
> 
> On 2017-04-17 03:14, Eli Zaretskii wrote:
> >> But the condition and the comment seem at odds, and it doesn't say much about why it calls `sit-for`.
> > 
> > I'm not quite sure what needs to be explained.  I think the doc string
> > of flyspell-delay and flyspell-default-delayed-commands tell the whole
> > story; if something is unclear there, please say what is unclear.
> 
> The code reads (cond ((get this-command 'flyspell-delayed) …)), but the comment says "The current command is not delayed".  Does a non-nil flycheck-delayed really mean that the command is *not* delayed?

I think the comment should be moved 2 lines below its current place,
that's all.

> > If you want to see this feature in action, turn on Flyspell, then type
> > something like "ssss", and then wait _without_ typing any non-word
> > character.  You will see that the mis-spelled word is marked only
> > after 3 sec, the default value of flyspell-delay.  Then contrast that
> > with the same word with a space typed after it.
> 
> Thanks! I don't expect that this feature is intended to slow down typing, though, right?  In the example I posted it makes typing painfully slow.

I didn't see any example in your OP, only a profile.  What did I miss?

And no, this is not supposed to slow down typing in any significant
way, as long as you type, because sit-for is supposed to return as
soon as input is available.  Your complaint was about CPU usage, not
about time delays, AFAIU.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.