bug#31138: Native json slower than json.el

[Dmitry Gutov]

On 22.04.2019 15:01, Eli Zaretskii wrote:

> > On 22.04.2019 1:12, Dmitry Gutov wrote:
> > > Considering libjansson manages to do both JSON parsing and string
> > > conversion in ~the same time make_specified_string only does string
> > > conversion on the returned strings, it most likely follows that
> > > make_specified_string could be made faster.
> >
> > ^ Sorry, I meant code_convert_string here.
>
> That one is called both for encoding the input and for decoding the
> strings in the result of parsing.

Right. So only the call to code_convert_string from json_make_string. 
The decoding part.

So roughly:

String encoding plus libjansson parsing plus other logic in json.c takes 
~the same time as string decoding only.