Web Performance
millionco/debug-agent
A skill your agent uses when the user reports jank, dropped frames, janky scrolling, slow click or typing response, poor INP, slow LCP, layout shifts (CLS), unresponsive pages, or asks to debug…
Use this when speeding up a web or Electron app's load or input.
Install Speedupskill
$ npx skills add jjcm/makefaster --skill speedupskill -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install jjcm/makefaster speedupskill --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/jjcm/makefaster.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skill .claude/skills/speedupskill && 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 "speedupskill" agent skill from https://github.com/jjcm/makefaster/tree/main/skill into .claude/skills/speedupskill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "speedupskill", 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/jjcm/makefaster/tree/main/skillType 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 jjcm/makefaster --skill speedupskill -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install jjcm/makefaster speedupskill --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jjcm/makefaster.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skill .agents/skills/speedupskill && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "speedupskill" agent skill from https://github.com/jjcm/makefaster/tree/main/skill into .agents/skills/speedupskill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "speedupskill", 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 jjcm/makefaster --skill speedupskill -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install jjcm/makefaster speedupskill --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jjcm/makefaster.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skill .cursor/skills/speedupskill && 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 "speedupskill" agent skill from https://github.com/jjcm/makefaster/tree/main/skill into .cursor/skills/speedupskill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "speedupskill", 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/jjcm/makefaster.git --path skill--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 jjcm/makefaster --skill speedupskill -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install jjcm/makefaster speedupskill --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jjcm/makefaster.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skill .gemini/skills/speedupskill && 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 "speedupskill" agent skill from https://github.com/jjcm/makefaster/tree/main/skill into .gemini/skills/speedupskill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "speedupskill", 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 jjcm/makefaster speedupskillInstalls 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 jjcm/makefaster --skill speedupskill -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/jjcm/makefaster.git skills-src && mkdir -p .github/skills && cp -r skills-src/skill .github/skills/speedupskill && 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 "speedupskill" agent skill from https://github.com/jjcm/makefaster/tree/main/skill into .github/skills/speedupskill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "speedupskill", 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 jjcm/makefaster --skill speedupskill -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install jjcm/makefaster speedupskill --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jjcm/makefaster.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skill .opencode/skills/speedupskill && 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 "speedupskill" agent skill from https://github.com/jjcm/makefaster/tree/main/skill into .opencode/skills/speedupskill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "speedupskill", 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
speedupskill- GitHub stars
- 162
- Token cost
- ~4.8k tokens
- SKILL.md length
- 2,737 words
- Files
- 2
- Skills in repo
- 2
- Repo updated
- First seen
- Licence
- None found
At a glance
Use this when speeding up a web or Electron app's load or input.
- Works in 7 steps: Do not wait on unused workspace data —… → Cut the critical JS graph to the first… → Stop the warm 304 storm → …
- Tasks that involve Web performance
- SKILL.md covers Run it as a packaged loop: npx…, Impact: largest (boot payload…, Impact: large (images, LCP,… and Impact: input path (Electron /…, plus 4 more sections
- Calls npx
What it does
Speedupskill is an agent skill from jjcm/makefaster. Use this when speeding up a web or Electron app's load or input. Concrete techniques that moved the needle in measured speed labs (DiffUI boot/LCP, bb large-paste jank) — not generic advice.
Its SKILL.md is about 4.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `README.md`).
It sits in Frontend & Design, covering Web performance and Mobile performance. It works with Electron. The repository describes itself as: Make Faster — website performance tools and site leaderboard.
When your agent uses it
- Tasks that involve Web performance
- Tasks that involve Mobile performance
Example prompts
- “/speedupskill”
Requirements
- Node.js
Workflow steps
7 steps, taken from the step headings in SKILL.md.
- Do not wait on unused workspace data — embed what this route needs
- Cut the critical JS graph to the first view
- Stop the warm 304 storm
- Serve the rung that matches the CSS slot
- Immutable / success-only cache for write-once /files/
- Large paste: O(n) parse, no full-text rescan per keystroke
- ThumbHash: average color now, budgeted decode, encode off the GET path
What it can do on your machine
Read from SKILL.md and the folder at commit ac0d115. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
npx
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):
github.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
Speedupskill loads about 4.8k tokens when it runs. Until then it costs about 51 tokens; SKILL.md has 2,737 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 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
Without a licence we can't republish the file, so here is its outline and opening line. It has 2,737 words (~4,812 tokens).
“When to use: the job is to make a web or Electron app faster to load or to type into — first content, LCP, TBT, or input latency after a large paste. Not visual polish, not ink/bleed filters, not a…”
- name
- speedupskill
Files
SKILL.md and 1 other file in skill of jjcm/makefaster.
- SKILL.md
- README.md
Open the folder on GitHubat commit ac0d115
Compare with similar skills
Speedupskill 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 |
|---|---|---|---|---|---|---|
| Speedupskill this skilljjcm/makefaster | 162 | — | ~4.8k | Automated safety check: Pass | None | |
| Web Performancemillionco/debug-agent | 303 | — | ~4.8k | Automated safety check: Pass | MIT | |
| Optimize Loadtextura-agency/next16-claude-starter | 132 | — | ~4.6k | Automated safety check: Notes | Unlicense | |
| React Native Best Practicescallstackincubator/agent-skills | 1.7k | 4 repos | ~3.1k | Automated safety check: Pass | MIT | |
| Production Bundle Auditkeybase/client | 9.3k | — | ~620 | Automated safety check: Pass | BSD-3-Clause | |
| React Doctormakeplane/plane | 60k | 12 repos | ~657 | Automated safety check: Pass | AGPL-3.0 |
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textura-agency/next16-claude-starter
Get a page into Lighthouse's green zone on desktop and mobile, for people AND for the robot form crawlers get — build it, audit all four categories (Performance, Accessibility, Best Practices, SEO)…
- Official
React Native Best Practices
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Provides React Native performance optimization guidelines for FPS, TTI, bundle size, memory leaks, re-renders, and animations.
Production Bundle Audit
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Builds the desktop Vite and iOS or Android Metro production bundles and checks them for tree-shaking problems, such as mobile-only modules leaking into the desktop build.
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Scans React code for lint, accessibility, bundle size and architecture issues, reports a health score and checks that changes do not lower it.
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More from jjcm/makefaster
Makefaster
jjcm/makefaster
Autoresearch loop that makes the site in this repo measurably faster.
Related
Works with
Categories
Questions about Speedupskill
What does Speedupskill do?
Use this when speeding up a web or Electron app's load or input. Speedupskill is an agent skill from jjcm/makefaster. Use this when speeding up a web or Electron app's load or input.
When should I use Speedupskill?
Speedupskill fits situations like: tasks that involve Web performance; tasks that involve Mobile performance.
How do I install Speedupskill in Claude Code?
Run `npx skills add jjcm/makefaster --skill speedupskill -a claude-code`. Or copy the skill folder (skill in jjcm/makefaster) into .claude/skills/speedupskill in your project. Claude Code loads it when a task matches its description.
How do I install Speedupskill in Codex?
Run `npx skills add jjcm/makefaster --skill speedupskill -a codex`. Or copy the skill folder (skill in jjcm/makefaster) into .agents/skills/speedupskill in your project. Codex loads it when a task matches its description.
Can I use Speedupskill 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 jjcm/makefaster --skill speedupskill -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/speedupskill, .gemini/skills/speedupskill, .github/skills/speedupskill and .opencode/skills/speedupskill in your project.
What does Speedupskill need to run?
Going by SKILL.md and its folder, Speedupskill needs the command-line tools its instructions call (npx). Our summary lists: Node.js.
Does Speedupskill access the network?
SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.
Is Speedupskill 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 Speedupskill use?
No licence was found for Speedupskill or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Speedupskill use?
About 4.8k tokens (SKILL.md is roughly 19k 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 Speedupskill?
Skills that share tags, products or a category with Speedupskill: Web Performance (millionco/debug-agent, 303 stars), Optimize Load (textura-agency/next16-claude-starter, 132 stars), React Native Best Practices (callstackincubator/agent-skills, 1.7k stars) and Production Bundle Audit (keybase/client, 9.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Speedupskill?
jjcm (a GitHub user) maintains it in jjcm/makefaster, which has 162 GitHub stars. The repository holds 2 skills in this directory. The repository was last updated on September 16, 2026.
Source: jjcm/makefaster on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.