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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 16:54:19 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 22.04.2019 10:16, Eli Zaretskii wrote:
Please don't forget that json-parse-string first_encodes_  the input
string in UTF-8, then passes it to libjansson, then_decodes_  each
string element it receives back.  So we do some non-trivial processing
besides make_specified_string, and removing decoding only saves part
of that.

That actually means that speeding up code_convert_string might *potentially* (e.g. if it's infinitely fast) yield more than 50% performance improvement.

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