[vim/vim] GTK4: Add gtk4-slow docs. (PR #20432)

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h_east

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Jun 5, 2026, 5:10:55 PM (3 days ago) Jun 5
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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20432

Commit Summary

File Changes

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h_east

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Jun 5, 2026, 5:22:25 PM (3 days ago) Jun 5
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h-east left a comment (vim/vim#20432)

(Cc: @64-bitman @mattn )


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Foxe Chen

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Jun 5, 2026, 5:27:13 PM (3 days ago) Jun 5
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64-bitman left a comment (vim/vim#20432)

Looks good


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mattn

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Jun 5, 2026, 8:27:37 PM (3 days ago) Jun 5
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mattn left a comment (vim/vim#20432)

LGTM, I guess LIBGL_ALWAYS_SOFTWARE=1 fixes your issue.

If GTK4 GUI is slow, frozen, or does not accept keyboard input just after startup,
it may be caused by the OpenGL renderer or GPU driver.  Try one of:

    GSK_RENDERER=cairo gvim
    LIBGL_ALWAYS_SOFTWARE=1 gvim

The former avoids the GSK OpenGL renderer.  The latter keeps the OpenGL renderer
but forces Mesa to use software rendering.


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h_east

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Jun 5, 2026, 9:09:44 PM (3 days ago) Jun 5
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h-east left a comment (vim/vim#20432)

@mattn Thanks! I've updated it based on your suggestions.


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Christian Brabandt

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Jun 7, 2026, 3:00:55 PM (2 days ago) Jun 7
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chrisbra left a comment (vim/vim#20432)

thanks


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