[WIP] Identify and suggest improvements to slow or inefficient code

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Identify and suggest improvements to slow or inefficient code

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Summary by cubic

Identifies slow or inefficient code and suggests targeted improvements to speed up the app and lower resource usage. No functional changes yet; this WIP collects findings and proposed refactors.

^{Written for commit b6a34b2. Summary will update automatically on new commits.}

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