Switching dark/light themes is slow

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
58/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
rust
Domain
frontend

Research direction

Reproduce the delay on https://docs.rs/ by changing the GNOME preference with gsettings set org.gnome.desktop.interface color-scheme, then compare it with an actual docs page such as https://docs.rs/glob/latest/glob/. Trace the theme-preference handling and identify why the homepage can take up to 10 seconds or fail to update; done means switching is consistently immediate.

Written by the indexing model from the issue text.

Description

When toggling the system preference[^1] for light/dark, the colors on https://docs.rs/ take any where from 0 to 10 seconds to switch (sometimes not at all if I muck around with it too much), compared to instant on an actual docs page, e.g. https://docs.rs/glob/latest/glob/.

[^1]: via gsettings set org.gnome.desktop.interface color-scheme

Dominant language
Rust
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Forks
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Avg merge
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Merged PRs (30d)
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