On 2017-04-15 03:59, Eli Zaretskii wrote:
>> From: Clément Pit--Claudel <cpitcla@mit.edu> Date: Sat, 15 Apr 2017
>> 01:35:45 -0400
>> 
>> I'm running into performance issues with JSON encoding and
>> decoding.  I have a language mode whose eldoc function makes a call
>> to a language server running as a subprocess, and small lags tend
>> to be visible when moving quickly around the buffer.  Profiling
>> suggests that roughly 25 percent of the time is spent encoding and
>> decoding JSON strings.
> 
> Can you show the profiles?  IME, the devil is almost always in the 
> details.

Sure; I've attached one.

>> Would there be strong objections to supporting a C JSON library in
>> addition to the current ELisp implementation?  This was suggested
>> at one point in
>> https://lists.gnu.org/archive/html/bug-gnu-emacs/2015-03/msg00770.html
>> .  It would be similar in spirit to supporting libxml-parse-region
>> along xml-parse-region, and it could provide nice speed boosts to
>> json-heavy ELisp programs.
> 
> Since we have modules now, something that wasn't available back
> then, you could roll your own library, right?

That's right! I forgot about these. Let me try :)