perf-lite

perf-lite is an agent for Claude Code from herbert-julio-azion/specialist-agent. It costs 25 tokens per session (201 once invoked), scanned A, original, MIT.

A lightweight tool for finding why an application is slow or why its JavaScript bundle is large. It examines runtime and bundle issues, then suggests focused fixes.

In plain words
What is it for?
Checking slow rendering, large bundles, excessive requests, missing caching, and other common application-speed problems.
Why use it?
Performance problems are often caused by a few bottlenecks hidden among many files or requests. This gives developers a short list of issues to investigate and measure.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the specialist-agent plugin — 57 agents shipped together

Good fit Checking slow rendering, large bundles, excessive requests, missing caching, and other common application-speed problems.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/herbert-julio-azion/specialist-agent/perf-lite
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/herbert-julio-azion/specialist-agent

Made for: Claude Code.

Or install specialist-agent, the plugin that ships this one along with the rest of its 57 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for perf-lite

README.md
[![agentmods](https://agentmods.dev/badge/agents/herbert-julio-azion/specialist-agent/perf-lite/github.svg)](https://agentmods.dev/agents/herbert-julio-azion/specialist-agent/perf-lite)
Your own site
<a href="https://agentmods.dev/agents/herbert-julio-azion/specialist-agent/perf-lite"><img src="https://agentmods.dev/badge/agents/herbert-julio-azion/specialist-agent/perf-lite/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for perf-lite

Your own site · 80×15
<a href="https://agentmods.dev/agents/herbert-julio-azion/specialist-agent/perf-lite"><img src="https://agentmods.dev/badge/agents/herbert-julio-azion/specialist-agent/perf-lite.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 25 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 201 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00025 $0.00201
Opus 5 $0.00013 $0.00101
Sonnet 5 $0.00005 $0.00040
Haiku 4.5 $0.00003 $0.00020

Measured 9d ago against content hash 3ad568e3a78b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

perf-lite scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/perf-lite.md · 43 lines

What it actually says

@perf-lite - Performance (Lite)

Mission

Quick performance analysis and optimization suggestions.

Workflow

  1. Profile - Analyze bundle and runtime
  2. Identify - Find top bottlenecks
  3. Suggest - Recommend optimizations

Quick Wins

Issue Fix
Large bundle Code splitting
Slow renders Memoization
Many requests Bundling
No cache Cache headers

Output

──── Perf Analysis ────
Bundle: [size]
Top issues: [list]
Quick wins: [suggestions]

Rules

  1. Profile before optimizing
  2. Focus on high-impact fixes
  3. Measure improvements
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 43 lines · 25 tokens per session scan A 3ad568e3a78b

Subscribe to this mod's changes

perf-lite is an agent published in the GitHub repository herbert-julio-azion/specialist-agent (21 stars, last pushed 13d ago), licensed MIT. It adds 25 tokens to every session and 201 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.