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bug#69071: Emacs master branch: c-ts-mode is slow with large C functions
From: |
Kévin Le Gouguec |
Subject: |
bug#69071: Emacs master branch: c-ts-mode is slow with large C functions. |
Date: |
Mon, 12 Feb 2024 14:14:05 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
Alan Mackenzie <acm@muc.de> writes:
> Hello, Emacs.
>
> Using Emacs master:
>
> c-ts-mode is slow on large C functions when editing towards the end of
> such a function.
>
> As an extreme example, there is a function proto_register_rrc in the
> file packet-rrc.c which is part of Wireshark. This file is "available"
> from Github, but sadly no longer freely available - you need to allow
> Microsoft's scripts to run on your machine. I'm willing to send this
> file by email to anybody who needs it. It is almost 10 MB in size.
Assuming we are talking about the same 10 MB file:
$ wget
https://raw.githubusercontent.com/wireshark/wireshark/master/epan/dissectors/packet-rrc.c
or
$ git clone --depth 1 https://github.com/wireshark/wireshark
$ find wireshark -name packet-rrc.c
might help?
I'd suggest heeding that repository's disclaimer and using the canonical
GitLab repo instead of the read-only GitHub mirror, but odds are
gitlab.com's JS won't fare better on the freedom front. Debian's mirror
might?
https://salsa.debian.org/debian/wireshark/-/blob/debian/master/epan/dissectors/packet-rrc.c
> proto_register_rrc is around 50,000 lines long, total size about 2¼ MB.
>
> Near the end of the function, after typing a character, there is a delay
> of between 9 and 10 seconds (on my 7 year old machine) before redisplay
> happens. This is too long. Some optimisation seems needed.
>
> On disabling font-lock-mode, the response becomes instantaneous.
- bug#69071: Emacs master branch: c-ts-mode is slow with large C functions., Alan Mackenzie, 2024/02/12
- bug#69071: Emacs master branch: c-ts-mode is slow with large C functions.,
Kévin Le Gouguec <=
- bug#69071: Emacs master branch: c-ts-mode is slow with large C functions., Eli Zaretskii, 2024/02/15
- bug#69071: Emacs master branch: c-ts-mode is slow with large C functions., Yuan Fu, 2024/02/15
- bug#69071: Emacs master branch: c-ts-mode is slow with large C functions., Yuan Fu, 2024/02/20
- bug#69071: Emacs master branch: c-ts-mode is slow with large C functions., Eli Zaretskii, 2024/02/20
- bug#69071: Emacs master branch: c-ts-mode is slow with large C functions., Yuan Fu, 2024/02/24
- bug#69071: Emacs master branch: c-ts-mode is slow with large C functions., Eli Zaretskii, 2024/02/25
- bug#69071: Emacs master branch: c-ts-mode is slow with large C functions., Yuan Fu, 2024/02/29