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Agent skill

Rezi Perf Profiling

by RtlZeroMemory in RtlZeroMemory/Rezi

Profile and optimize Rezi app performance. An agent skill from RtlZeroMemory/Rezi.

Apache-2.0Auto-check passedFrontend & Design

Install Rezi Perf Profiling

skills CLI
$ npx skills add RtlZeroMemory/Rezi --skill rezi-perf-profiling -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install RtlZeroMemory/Rezi rezi-perf-profiling --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/RtlZeroMemory/Rezi.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.codex/skills/rezi-perf-profiling .claude/skills/rezi-perf-profiling && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
rezi-perf-profiling
GitHub stars
675
Token cost
~625 tokens
SKILL.md length
209 words
Files
1
Skills in repo
10
Repo updated
First seen
Licence
Apache-2.0

At a glance

Profile and optimize Rezi app performance. An agent skill from RtlZeroMemory/Rezi.

  • Works in 5 steps: Enable profiling and run → Observe phase timings: view → commit →… → Run systematic profiling → …
  • Render phases take too long
  • SKILL.md covers When to use, Source of truth, Steps and Key optimization patterns
  • Calls npx and node

What it does

Rezi Perf Profiling is an agent skill from RtlZeroMemory/Rezi. Profile and optimize Rezi app performance. Use when app feels slow, frames drop, or render phases take too long.

Its SKILL.md is about 630 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design. The repository describes itself as: Build TypeScript TUI backed by fast native rendering engine. The licence is Apache-2.0.

When your agent uses it

  • Render phases take too long

Example prompts

  • “/rezi-perf-profiling”

Requirements

  • Node.js
  • Pre-approved tools (allowed-tools): Read, Glob, Grep, Bash(REZI_PERF=1 REZI_PERF_DETAIL=1 *), Bash(npx tsx packages/bench/*)

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Enable profiling and run
  2. Observe phase timings: view → commit → layout → render → build
  3. Run systematic profiling
  4. Apply common fixes
  5. Depth guardrails

What it can do on your machine

Read from SKILL.md and the folder at commit 671a8a2. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Glob
    • Grep
    • Bash(REZI_PERF=1 REZI_PERF_DETAIL=1 *)
    • Bash(npx tsx packages/bench/*)

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • npx
    • node

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npx, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Rezi Perf Profiling loads about 625 tokens when it runs. Until then it costs about 33 tokens; SKILL.md has 209 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~33
When it runs · the whole SKILL.md, loaded when a task matches
~625

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from RtlZeroMemory/Rezi at commit 671a8a2, republished under its Apache-2.0 licence (© RtlZeroMemory). 209 words, ~625 tokens.

Download SKILL.mdSave it as .claude/skills/rezi-perf-profiling/SKILL.md (or your agent's skills folder).
name
rezi-perf-profiling
description
Profile and optimize Rezi app performance. Use when app feels slow, frames drop, or render phases take too long.
allowed-tools
Read, Glob, Grep, Bash(REZI_PERF=1 REZI_PERF_DETAIL=1 *), Bash(npx tsx packages/bench/*)
user-invocable
true
argument-hint
[performance-concern]
metadata.short-description
Performance profiling

When to use

Use this skill when:

  • App feels slow or unresponsive
  • Frames drop or input lags
  • Need to identify which render phase is the bottleneck
  • Optimizing a specific widget or screen

Source of truth

  • packages/core/src/app/widgetRenderer.ts — render pipeline with phase timing
  • packages/core/src/runtime/commit.ts — reconciliation (leaf/container reuse)
  • packages/core/src/layout/ — layout engine (FNV-1a stability signatures)
  • packages/core/src/widgets/composition.ts — animation utility hooks
  • packages/bench/src/ — profiling scripts

Steps

  1. Enable profiling and run:

    bash
    REZI_PERF=1 REZI_PERF_DETAIL=1 node your-app.js

  2. Observe phase timings: view → commit → layout → render → build

  3. Run systematic profiling:

    bash
    npx tsx packages/bench/src/profile-phases.ts
npx tsx packages/bench/src/profile-construction.ts

  4. Apply common fixes:

    BottleneckFix
    View phase slowctx.useMemo(() => expensiveComputation, [deps]) for expensive computations
    Commit phase slowAdd key props on list items for stable reconciliation
    Layout phase slowReduce nesting depth; layout stability signatures skip relayout when tree is stable
    Render phase slowUse ui.virtualList() for large datasets
    Animation-heavy screen slowLimit transition scope (properties), animate only visible rows, avoid per-frame object churn
    Overall slowFlatten unnecessary wrapper nodes

  5. Depth guardrails:

    • Warning at 200 levels
    • Fatal at 500 levels
    • Refactor deep nesting into flatter structures

Key optimization patterns

  • ctx.useMemo(() => expensiveComputation, [deps]) — skip recomputation
  • key on every list item — enables O(1) reconciliation
  • ui.virtualList() — only renders visible rows
  • useStagger(...) + ui.virtualList(...) — stagger only the visible window
  • ui.box({ transition: { properties: [...] } }) — animate only required dimensions
  • Avoid creating new closures/objects in render — use ctx.useCallback(fn, [deps])

© RtlZeroMemory, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .codex/skills/rezi-perf-profiling of RtlZeroMemory/Rezi.

Open the folder on GitHubat commit 671a8a2

Compare with similar skills

Rezi Perf Profiling next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Rezi Perf Profiling compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Rezi Perf Profiling this skillRtlZeroMemory/Rezi675—~625Automated safety check: PassApache-2.0
Web Artifacts Builderanthropics/skills180k41 repos~769Automated safety check: PassApache-2.0
React Doctormakeplane/plane61k12 repos~657Automated safety check: PassAGPL-3.0
Impeccablebestofjs/bestofjs3.1k27 repos~2.6kAutomated safety check: PassMIT
Figma Design System Builderwarpdotdev/warp65k2 repos~4.4kAutomated safety check: PassAGPL-3.0
Web Interface Guidelines Reviewervercel-labs/openreview1.7k98 repos~308Automated safety check: PassNone

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More from RtlZeroMemory/Rezi

All 10 skills in this repo

  • Rezi Add Widget

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    675 GitHub stars~815 tokensUpdated 3 mo ago
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  • Rezi Data Table

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  • Rezi Debug Rendering

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  • Rezi Forms

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  • Rezi Keybindings

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Categories

Questions about Rezi Perf Profiling

What does Rezi Perf Profiling do?

Profile and optimize Rezi app performance. An agent skill from RtlZeroMemory/Rezi. Rezi Perf Profiling is an agent skill from RtlZeroMemory/Rezi. Profile and optimize Rezi app performance.

When should I use Rezi Perf Profiling?

Rezi Perf Profiling fits situations like: render phases take too long.

How do I install Rezi Perf Profiling in Claude Code?

Run `npx skills add RtlZeroMemory/Rezi --skill rezi-perf-profiling -a claude-code`. Or copy the skill folder (.codex/skills/rezi-perf-profiling in RtlZeroMemory/Rezi) into .claude/skills/rezi-perf-profiling in your project. Claude Code loads it when a task matches its description.

How do I install Rezi Perf Profiling in Codex?

Run `npx skills add RtlZeroMemory/Rezi --skill rezi-perf-profiling -a codex`. Or copy the skill folder (.codex/skills/rezi-perf-profiling in RtlZeroMemory/Rezi) into .agents/skills/rezi-perf-profiling in your project. Codex loads it when a task matches its description.

Can I use Rezi Perf Profiling in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add RtlZeroMemory/Rezi --skill rezi-perf-profiling -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/rezi-perf-profiling, .gemini/skills/rezi-perf-profiling, .github/skills/rezi-perf-profiling and .opencode/skills/rezi-perf-profiling in your project.

What does Rezi Perf Profiling need to run?

Going by SKILL.md and its folder, Rezi Perf Profiling needs the command-line tools its instructions call (npx and node). Our summary lists: Node.js. Its frontmatter pre-approves these tools: Read, Glob, Grep, Bash(REZI_PERF=1 REZI_PERF_DETAIL=1 *), Bash(npx tsx packages/bench/*).

Does Rezi Perf Profiling access the network?

SKILL.md contains no URLs. Its commands use npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Rezi Perf Profiling safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Rezi Perf Profiling use?

Rezi Perf Profiling is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Rezi Perf Profiling use?

About 625 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Rezi Perf Profiling?

Skills that share tags, products or a category with Rezi Perf Profiling: Web Artifacts Builder (anthropics/skills, 180k stars), React Doctor (makeplane/plane, 61k stars), Impeccable (bestofjs/bestofjs, 3.1k stars) and Figma Design System Builder (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Rezi Perf Profiling?

RtlZeroMemory (a GitHub user) maintains it in RtlZeroMemory/Rezi, which has 675 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on June 17, 2026.

Source: RtlZeroMemory/Rezi on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.