Claude Code mod
perf-delta
/perf runs a benchmark command several times and compares it with its baseline (saved earlier, or a git ref run in a temporary worktree): median wall time, peak memory and the spread of the runs, and whether the difference is larger than the noise
Install
/plugin marketplace add simota/claude-mods
/plugin install perf-delta@simota-modsMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: runs processes, reads files, reads env vars, reads mod state, persists state, draws
- Draws in
Pane- Hooks
session.startcommand.runui.render
From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.
How Claude Code mods work
- A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
- It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
- Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
- Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.
Details
- Repository
- simota/claude-mods
- Folder
mods/perf-delta- Marketplace
simota-mods- Author
- simota
- License
- MIT
- Last updated
- 8 November 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is perf-delta?
/perf runs a benchmark command several times and compares it with its baseline (saved earlier, or a git ref run in a temporary worktree): median wall time, peak memory and the spread of the runs, and whether the difference is larger than the noise It is a mod for Claude Code, from simota/claude-mods on GitHub.
What can the perf-delta mod access?
Its widest reach is "writes or runs" (runs processes, reads files, reads env vars, reads mod state, persists state, draws). It draws in Pane. Like any mod, it runs with your permissions.
How do I install perf-delta?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add simota/claude-mods and then /plugin install perf-delta@simota-mods.
Is perf-delta popular?
simota/claude-mods has 1 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 8 November 2026.
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