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

["Clément Pit-Claudel" <cpitclaudel@gmail.com>]

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?

> 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.

Clément.