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bug#31138: Native json slower than json.el

From: Dmitry Gutov
Subject: bug#31138: Native json slower than json.el
Date: Mon, 22 Apr 2019 16:11:52 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

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.

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