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bug#23223: 25.0.92; Can xref-find-references be sped up?

From: Dmitry Gutov
Subject: bug#23223: 25.0.92; Can xref-find-references be sped up?
Date: Tue, 12 Apr 2016 23:26:13 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.0

On 04/12/2016 10:16 PM, Eli Zaretskii wrote:

The same search, immediately repeated from the same directory.  More
accurately, the first time I invoke xref-find-references in the
top-level directory of the Emacs repository, I get 980 matches;
thereafter, all the subsequent searches from the same Emacs session
yield 1128 matches.  This is with the ID database present in the
top-level directory.

In the same scenario, I consistently get 1076 matches (on a GNU/Linux system): https://asciinema.org/a/69fdwo7os38fxu01e4fcwftwv

All the searches are done from *scratch* in "emacs -Q".

The screencast above starts from Dired, but it's the same if I start from *scratch*.

Let me know if I can provide more info.

Could you compare the lists of matches you get? E.g. C-x C-s on the xref buffer in both cases, and then diff the results.

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