phx-perf
Analyze Elixir/Phoenix performance — N+1 queries, assign bloat, ecto optimization, genserver bottlenecks. Use when slowness, timeouts, or high memory reported.
npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-perf --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Performance Analysis Analyze code for performance issues across Ecto, LiveView, and OTP layers. Prioritize findings by impact and effort. ## Usage ``` phx-perf # Analyze full project phx-perf lib/my_app/accounts.ex # Analyze specific module phx-perf --focus ecto # Ecto queries only phx-perf --focus liveview # LiveView memory only phx-perf --focus otp # OTP bottlenecks only ``` ## Arguments `$ARGUMENTS` = Optional module/context path and `--focus` flag. ## Iron Laws 1. **MEASURE BEFORE OPTIMIZING** — Never optimize without evidence of a problem 2. **DATABASE FIRST** — 90% of Elixir performance issues are query-related 3. **ONE CHANGE AT A TIME** — Isolate optimizations to measure impact 4. **NEVER benchmark in dev mode** — Always use `MIX_ENV=prod` for performance measurements; dev mode includes code reloading, debug logging, and unoptimized compilation that invalidate results ## Workflow ### Step 1: Identify Scope Check specific file if provided. Otherwise scan full project: ```bash # Find hot paths: contexts, LiveViews, workers find lib/ -name "*.ex" | head -50 ``` ### Step 2: Run Analysis Tracks Spawn analysis agents in parallel based on focus: **Ecto Track** (default or `--foc
- Usage
- Arguments
- Iron Laws
- Workflow
- Step 1: Identify Scope
- Step 2: Run Analysis Tracks
- Step 3: Prioritize Findings
- Step 4: Present Top 5
- Step 5: Offer Next Steps
- Tidewave Integration
- References
Find hot paths: contexts, LiveViews, workers find lib/ -name "*.ex" | head -50
What does the phx-perf skill do?
Analyze Elixir/Phoenix performance — N+1 queries, assign bloat, ecto optimization, genserver bottlenecks. Use when slowness, timeouts, or high memory reported.
How do I install it?
Run `npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-perf --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From oliver-kriska/claude-elixir-phoenix, a repository with 515 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.