React DevTools Profile Analyzer
keybase/client
Parses a React DevTools Profiler JSON export with Python scripts to find re-render storms, commit fan-out and why a component rendered, without opening the DevTools UI.
Guide performance profiling with Instruments, diagnose hangs, memory issues, slow launches, and energy drain.
Install Performance Profiling
$ npx skills add gustavscirulis/snapgrid --skill performance-profiling -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install gustavscirulis/snapgrid performance-profiling --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/skills/performance/profiling .claude/skills/performance-profiling && rm -rf skills-srcUse ~/.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/
Install the "performance-profiling" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/performance/profiling into .claude/skills/performance-profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance-profiling", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/performance/profilingType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add gustavscirulis/snapgrid --skill performance-profiling -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install gustavscirulis/snapgrid performance-profiling --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/skills/performance/profiling .agents/skills/performance-profiling && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "performance-profiling" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/performance/profiling into .agents/skills/performance-profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance-profiling", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add gustavscirulis/snapgrid --skill performance-profiling -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install gustavscirulis/snapgrid performance-profiling --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/skills/performance/profiling .cursor/skills/performance-profiling && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "performance-profiling" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/performance/profiling into .cursor/skills/performance-profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance-profiling", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/gustavscirulis/snapgrid.git --path .claude/skills/skills/performance/profiling--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add gustavscirulis/snapgrid --skill performance-profiling -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install gustavscirulis/snapgrid performance-profiling --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/skills/performance/profiling .gemini/skills/performance-profiling && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "performance-profiling" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/performance/profiling into .gemini/skills/performance-profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance-profiling", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install gustavscirulis/snapgrid performance-profilingInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add gustavscirulis/snapgrid --skill performance-profiling -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/skills/performance/profiling .github/skills/performance-profiling && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "performance-profiling" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/performance/profiling into .github/skills/performance-profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance-profiling", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add gustavscirulis/snapgrid --skill performance-profiling -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install gustavscirulis/snapgrid performance-profiling --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/skills/performance/profiling .opencode/skills/performance-profiling && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "performance-profiling" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/performance/profiling into .opencode/skills/performance-profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performance-profiling", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
performance-profiling- GitHub stars
- 117
- Used in
- 1 other repo
- Token cost
- ~1.7k tokens
- SKILL.md length
- 547 words
- Files
- 5
- Skills in repo
- 120
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Guide performance profiling with Instruments, diagnose hangs, memory issues, slow launches, and energy drain.
- Works in 4 steps: Identify the Problem Category → Read the Appropriate Reference File → Profile on Real Hardware → …
- Reviewing app performance
- SKILL.md covers When This Skill Activates, Decision Tree, Quick Reference and Process, plus 4 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Performance Profiling is an agent skill from gustavscirulis/snapgrid. Guide performance profiling with Instruments, diagnose hangs, memory issues, slow launches, and energy drain. Use when reviewing app performance or investigating specific bottlenecks.
Its SKILL.md is about 1.7k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files (for example `energy-diagnostics.md`, `launch-optimization.md` and `memory-profiling.md`).
It sits in Development, covering Performance optimization. The repository describes itself as: SnapGrid is an open-source Mac app for collecting, organizing, and analyzing UI screenshots. It uses AI to automatically detect UI components and patterns, making it a powerful…
When your agent uses it
- Reviewing app performance
- Investigating specific bottlenecks
Example prompts
- “/performance-profiling”
Requirements
- Pre-approved tools (allowed-tools): Read, Glob, Grep, Bash
Workflow steps
4 steps, taken from the step headings in SKILL.md.
- Identify the Problem Category
- Read the Appropriate Reference File
- Profile on Real Hardware
- Apply Fixes and Verify
What it can do on your machine
Read from SKILL.md and the folder at commit eb7eaf4. 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:
ReadGlobGrepBash
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are swift).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
developer.apple.com
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
Performance Profiling loads about 1.7k tokens when it runs. Until then it costs about 51 tokens; SKILL.md has 547 words of instructions outside code blocks.
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: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
allowed-tools: Read, Glob, Grep, Bash
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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 547 words (~1,697 tokens).
“Systematic guide for profiling Apple platform apps using Instruments, Xcode diagnostics, and MetricKit. Covers CPU, memory, launch time, and energy analysis with actionable fix patterns.”
- name
- performance-profiling
- allowed-tools
- Read, Glob, Grep, Bash
Files
SKILL.md and 4 other files in .claude/skills/skills/performance/profiling of gustavscirulis/snapgrid.
- SKILL.md
- energy-diagnostics.md
- launch-optimization.md
- memory-profiling.md
- time-profiler.md
Open the folder on GitHubat commit eb7eaf4
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in gustavscirulis/snapgrid, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Performance 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Performance Profiling this skillgustavscirulis/snapgrid | 117 | 1 repos | ~1.7k | Automated safety check: Notes | Custom licence | |
| React DevTools Profile Analyzerkeybase/client | 9.3k | — | ~978 | Automated safety check: Pass | BSD-3-Clause | |
| Native App Performanceharperreed/dotfiles | 334 | 4 repos | ~538 | Automated safety check: Pass | None | |
| Pixijs Performancepixijs/pixijs-skills | 347 | — | ~4.6k | Automated safety check: Pass | MIT | |
| Performance Profilingconorluddy/xclaude-plugin | 183 | — | ~7.3k | Automated safety check: Pass | MIT | |
| Debugging Instrumentsdpearson2699/swift-ios-skills | 1.2k | — | ~3.6k | Automated safety check: Pass | Custom licence |
Similar skills
Native App Performance
harperreed/dotfiles
Native macOS/iOS app performance profiling via xctrace/Time Profiler and CLI-only analysis of Instruments traces.
Pixijs Performance
pixijs/pixijs-skills
A skill your agent uses when profiling or optimizing a PixiJS v8 app for FPS, draw calls, or GPU memory.
Performance Profiling
conorluddy/xclaude-plugin
Instruments integration and performance analysis workflows for iOS apps.
Debugging Instruments
dpearson2699/swift-ios-skills
Debug iOS apps and profile performance using LLDB, the interactive Memory Graph Debugger, and Instruments.
Argent Native Profiler
bbplayer-app/BBPlayer
Native profiling for CPU hotspots, UI hangs, memory issues. An agent skill from bbplayer-app/BBPlayer.
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Related
Categories
Questions about Performance Profiling
What does Performance Profiling do?
Guide performance profiling with Instruments, diagnose hangs, memory issues, slow launches, and energy drain. Performance Profiling is an agent skill from gustavscirulis/snapgrid. Guide performance profiling with Instruments, diagnose hangs, memory issues, slow launches, and energy drain.
When should I use Performance Profiling?
Performance Profiling fits situations like: reviewing app performance; investigating specific bottlenecks.
How do I install Performance Profiling in Claude Code?
Run `npx skills add gustavscirulis/snapgrid --skill performance-profiling -a claude-code`. Or copy the skill folder (.claude/skills/skills/performance/profiling in gustavscirulis/snapgrid) into .claude/skills/performance-profiling in your project. Claude Code loads it when a task matches its description.
How do I install Performance Profiling in Codex?
Run `npx skills add gustavscirulis/snapgrid --skill performance-profiling -a codex`. Or copy the skill folder (.claude/skills/skills/performance/profiling in gustavscirulis/snapgrid) into .agents/skills/performance-profiling in your project. Codex loads it when a task matches its description.
Can I use Performance 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 gustavscirulis/snapgrid --skill performance-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/performance-profiling, .gemini/skills/performance-profiling, .github/skills/performance-profiling and .opencode/skills/performance-profiling in your project.
What does Performance Profiling need to run?
SKILL.md names no scripts, command-line tools or credentials: Performance Profiling is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Glob, Grep, Bash.
Does Performance Profiling access the network?
SKILL.md names 1 domain. As links in the text: developer.apple.com. This is read from the text; nothing was executed.
Is Performance Profiling safe to install?
Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.
What licence does Performance Profiling use?
Performance Profiling has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Performance Profiling use?
About 1.7k tokens (SKILL.md is roughly 6.8k 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 Performance Profiling?
Skills that share tags, products or a category with Performance Profiling: React DevTools Profile Analyzer (keybase/client, 9.3k stars), Native App Performance (harperreed/dotfiles, 334 stars), Pixijs Performance (pixijs/pixijs-skills, 347 stars) and Performance Profiling (conorluddy/xclaude-plugin, 183 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Performance Profiling?
gustavscirulis (a GitHub user) maintains it in gustavscirulis/snapgrid, which has 117 GitHub stars. The repository holds 120 skills in this directory. The repository was last updated on April 30, 2026.
Source: gustavscirulis/snapgrid on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.