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Analyze Elixir/Phoenix performance — N+1 queries, assign bloat, ecto optimization, genserver bottlenecks.
Passed 16 of 19 test cases with the skill, and 7 of 19 without it.
and 8 more in the full report
11 fixed8 passed either way3 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 11 test cases the skill fixed. Same model, same prompt, with and without the skill.
We want to run a targeted performance scan specifically looking for unbounded assigns, missing streams, and missing assign_async calls in our user interface code. Which command-line flag limits the scan strictly to LiveView issues?
| Checked | Without skill | With skill |
|---|---|---|
| Recommends using the `--focus liveview` flag. | Missed | Passed |
The instructions your model reads when the skill loads.
Analyze code for performance issues across Ecto, LiveView, and OTP layers. Prioritize findings by impact and effort.
/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 = Optional module/context path and --focus flag.
MIX_ENV=prod for performance measurements; dev mode includes code reloading, debug logging, and unoptimized compilation that invalidate resultsCheck specific file if provided. Otherwise scan full project:
# Find hot paths: contexts, LiveViews, workers
find lib/ -name "*.ex" | head -50
Spawn analysis agents in parallel based on focus:
test cases passed, vs 7 / 19 without
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