CharlesWiltgen
Registry indexed
axiom-performance
Use when app feels slow, memory grows, battery drains, or diagnosing ANY performance issue. Covers memory leaks, profiling, Instruments workflows, retain cycles, performance optimization.
Registry indexed
Use when app feels slow, memory grows, battery drains, or diagnosing ANY performance issue. Covers memory leaks, profiling, Instruments workflows, retain cycles, performance optimization.
Use when app feels slow, memory grows, battery drains, or diagnosing ANY performance issue. Covers memory leaks, profiling, Instruments workflows, retain cycles, performance optimization.
Source documentation, not instructions for this website. Review permissions before running any commands.
You MUST use this skill for ANY performance issue including memory leaks, slow execution, battery drain, or profiling.
Not on Claude Code? Where this router says "Launch
some-auditoragent", read that auditor's file in this suite and follow it inline — the same procedure, needing only file search and read.Available here:
skills/energy-auditor.md,skills/memory-auditor.md,skills/swift-performance-analyzer.md.Agents that need Bash — builds, tests, simulators, crash symbolication — stay Claude Code-only; there is no inline equivalent for those.
Use this router when:
Memory leaks (Swift) → See skills/memory-debugging.md
Memory leak scan → Launch memory-auditor agent or /axiom:audit memory (5-phase semantic audit: maps resource ownership, detects 6 leak patterns, reasons about missing cleanup, correlates compound risks, scores lifecycle health)
Memory leaks (Objective-C blocks) → See skills/objc-block-retain-cycles.md
Performance profiling (GUI) → See skills/performance-profiling.md
OS27)Automated profiling (CLI) → See skills/xctrace-ref.md
Run automated profile → Use performance-profiler agent or /axiom:profile
Compare two traces / detect regressions → See skills/trace-comparison.md or /axiom:compare-traces
xcprof compare --fail-on-regression (non-zero exit)App hangs or freezes → See skills/hang-diagnostics.md
Corpus/aggregate hang triage (Sentry, ASC) → axiom-shipping (skills/production-triage.md) + triage-analyzer agent
anr_idle_runloop vs anr_main_thread_block across the corpusSlow app launch → See skills/app-launch.md
dyld Activity, measurement hygieneMERGED_BINARY_TYPE/MERGEABLE_LIBRARY), +load, main-thread deferral, priority inversionXCTApplicationLaunchMetric regression test, MXAppLaunchMetric field histograms, custom "app is interactive" signpostBattery drain, high energy → See skills/energy.md
Symptom-based diagnosis → See skills/energy-diag.md
API reference with code → See skills/energy-ref.md
Energy scan → Launch energy-auditor agent or /axiom:audit energy (8 anti-patterns: timer abuse, polling, continuous location, animation leaks, background mode misuse, network inefficiency, GPU waste, disk I/O)
Timer crash patterns (DispatchSourceTimer) → See axiom-integration (skills/timer-patterns.md)
Timer API reference → See axiom-integration (skills/timer-patterns-ref.md)
Swift performance optimization → See skills/swift-performance.md
Swift performance scan → Launch swift-performance-analyzer agent or /axiom:audit swift-performance (unnecessary copies, ARC overhead, unspecialized generics, collection inefficiencies, actor isolation costs, memory layout)
Modern Swift idioms → See axiom-swift (skills/swift-modern.md)
MetricKit API reference → See skills/metrickit-ref.md
OS27): MetricManager AsyncSequence streams, typed MetricResult metrics (incl. Metal frame rate, storage), typed diagnostics with termination categories, launch-task trackingOS27): split hitch/hang/memory metrics by tab, mode, or experimentOS27): process crashes at crash time with in-extension symbolication (Part 10)Capture simulator console output → /axiom:console
--timeout and --max-linesLLDB interactive debugging → See axiom-build (skills/lldb.md)
LLDB command reference → See axiom-build (skills/lldb-ref.md)
axiom-shipping (skills/production-triage.md) + triage-analyzeraxiom-concurrency (callback contention, not profiling)| Thought | Reality |
|---|---|
| "I know it's a memory leak, let me find it" | Memory leaks have 6 patterns. memory-debugging diagnoses the right one in 15 min vs 2 hours. |
| "I'll just run Time Profiler" | Wrong Instruments template wastes time. performance-profiling selects the right tool first. |
| "Battery drain is probably the network layer" | Energy issues span 8 subsystems. energy skill diagnoses the actual cause. |
| "App feels slow, I'll optimize later" | Performance issues compound. Profiling now saves exponentially more time later. |
| "It's just a UI freeze, probably a slow API call" | Freezes have busy vs blocked causes. hang-diagnostics has a decision tree for both. |
| "Memory is climbing AND scrolling stutters — two separate bugs" | Memory pressure causes GC pauses that drop frames. Fix the leak first, then re-check scroll performance. |
| "It only freezes on first launch, must be loading something" | First-launch hangs have 3 patterns: synchronous I/O, lazy initialization, main thread contention. hang-diagnostics diagnoses which. |
| "Launch feels slow — I'll trim some startup code" | Launch has 3 phases (pre-main / main→first frame / extended) and a watchdog. app-launch tells you which phase to profile, with measurement hygiene so the number means something. |
| "Launch is fine, it's f |
name: axiom-performance description: Use when app feels slow, memory grows, battery drains, or diagnosing ANY performance issue. Covers memory leaks, profiling, Instruments workflows, retain cycles, performance optimization. license: MIT
--- name: axiom-performance description: Use when app feels slow, memory grows, battery drains, or diagnosing ANY performance issue. Covers memory leaks, profiling, Instruments workflows, retain cycles, performance optimization. license: MIT --- # Performance **You MUST use this skill for ANY performance issue including memory leaks, slow execution, battery drain, or profiling.** <!-- AXIOM_AUDITOR_INLINE_BEGIN — auto-maintained by scripts/build-inlined-auditors.ts; do not hand-edit --> > **Not on Claude Code?** Where this router says "Launch `some-auditor` agent", read that auditor's file in this suite and follow it inline — the same procedure, needing only file search and read. > > Available here: `skills/energy-auditor.md`, `skills/memory-auditor.md`, `skills/swift-performance-analyzer.md`. > > Agents that need Bash — builds, tests, simulators, crash symbolication — stay Claude Code-only; there is no inline equivalent for those. <!-- AXIOM_AUDITOR_INLINE_END --> ## When to Use Use this router when: - App feels slow or laggy - Memory usage grows over time - Battery drains quickly - Device gets hot during use - High energy usage in Battery Settings - Diagnosing performance with Instruments - Memory leaks or retain cycles - App crashes with memory warnings ## Routing Logic ### Memory Issues **Memory leaks (Swift)** → See skills/memory-debugging.md - Systematic leak diagnosis - 5 common leak patterns - Instruments workflows - deinit not called **Memory leak scan** → Launch `memory-auditor` agent or `/axiom:audit memory` (5-phase semantic audit: maps resource ownership, detects 6 leak patterns, reasons about missing cleanup, correlates compound risks, scores lifecycle health) **Memory leaks (Objective-C blocks)** → See skills/objc-block-retain-cycles.md - Block retain cycles - Weak-strong pattern - Network callback leaks ### Performance Profiling **Performance profiling (GUI)** → See skills/performance-profiling.md - Time Profiler (CPU), incl. Top Functions mode for scattered overhead (`OS27`) - Allocations (memory growth) - Core Data profiling (N+1 queries) - Decision trees for tool selection - Instruments 27 Run Comparisons, Swift executors instrument, Foundation Models instrument; Xcode 27 Organizer (Storage/hitches metrics, Metric Goals, Generate Recommendations) **Automated profiling (CLI)** → See skills/xctrace-ref.md - Headless xctrace profiling - CI/CD integration patterns - Command-line trace recording - Programmatic trace analysis **Run automated profile** → Use `performance-profiler` agent or `/axiom:profile` - Records trace via xctrace - Exports and analyzes data - Reports findings with severity **Compare two traces / detect regressions** → See skills/trace-comparison.md or `/axiom:compare-traces` - Did this change slow down a hot path? Function-level CPU-share deltas - CI gating with `xcprof compare --fail-on-regression` (non-zero exit) - Regressions vs improvements, severity ranking, exit-code semantics ### Hang/Freeze Issues **App hangs or freezes** → See skills/hang-diagnostics.md - UI unresponsive for >1 second - Main thread blocked (busy or waiting) - Decision tree: busy vs blocked diagnosis - Time Profiler vs System Trace selection - 8 common hang patterns with fixes - Watchdog terminations **Corpus/aggregate hang triage (Sentry, ASC)** → `axiom-shipping (skills/production-triage.md)` + `triage-analyzer` agent - Multiple grouped hang reports from an aggregator, not a single .ips file - Classify `anr_idle_runloop` vs `anr_main_thread_block` across the corpus - Flag suspension/idle-runloop false-positives (the #1 hang by user count is often noise) - Cluster into root-cause families and rank by impact ### App Launch **Slow app launch** → See skills/app-launch.md - Slow first frame, frozen first screen, launch regression in Organizer - Launch-phase model (pre-main / main→first frame / extended launch) - Cold vs warm vs hot/resume vs notification launch — how to reproduce each - App Launch instrument workflow, `dyld Activity`, measurement hygiene - Pre-main fixes: linkage strategy (static vs dynamic vs mergeable, `MERGED_BINARY_TYPE`/`MERGEABLE_LIBRARY`), `+load`, main-thread deferral, priority inversion - `XCTApplicationLaunchMetric` regression test, `MXAppLaunchMetric` field histograms, custom "app is interactive" signpost - Push-notification launch path (tap→first pixel / tap→interactive targets) ### Energy Issues **Battery drain, high energy** → See skills/energy.md - Power Profiler workflow - Subsystem diagnosis (CPU/GPU/Network/Location/Display) - Anti-pattern fixes - Background execution optimization **Symptom-based diagnosis** → See skills/energy-diag.md - "App at top of Battery Settings" - "Device gets hot" - "Background battery drain" - Time-cost analysis for each path **API reference with code** → See skills/energy-ref.md - Complete WWDC code examples - Timer, network, location efficiency - BGContinuedProcessingTask (iOS 26) - MetricKit setup **Energy scan** → Launch `energy-auditor` agent or `/axiom:audit energy` (8 anti-patterns: timer abuse, polling, continuous location, animation leaks, background mode misuse, network inefficiency, GPU waste, disk I/O) ### Timer Safety **Timer crash patterns (DispatchSourceTimer)** → See `axiom-integration` (skills/timer-patterns.md) - 4 crash scenarios causing EXC_BAD_INSTRUCTION - RunLoop mode gotcha (Timer stops during scroll) - SafeDispatchTimer wrapper - Timer vs DispatchSourceTimer decision **Timer API reference** → See `axiom-integration` (skills/timer-patterns-ref.md) - Timer, DispatchSourceTimer, Combine, AsyncTimerSequence APIs - Lifecycle diagrams - Platform availability ### Swift Performance **Swift performance optimization** → See skills/swift-performance.md - Value vs reference types, copy-on-write - ARC overhead, generic specialization - Collection performance **Swift performance scan** → Launch `swift-performance-analyzer` agent or `/axiom:audit swift-performance` (unnecessary copies, ARC overhead, unspecialized generics, collection inefficiencies, actor isolation costs, memory layout) **Modern Swift idioms** → See axiom-swift (skills/swift-modern.md) - Outdated API patterns (Date(), CGFloat, DateFormatter) - Foundation modernization (URL.documentsDirectory, FormatStyle) - Claude-specific hallucination corrections ### MetricKit Integration **MetricKit API reference** → See skills/metrickit-ref.md - New Swift-first API (`OS27`): MetricManager AsyncSequence streams, typed MetricResult metrics (incl. Metal frame rate, storage), typed diagnostics with termination categories, launch-task tracking - Per-state metrics (StateReporting framework, `OS27`): split hitch/hang/memory metrics by tab, mode, or experiment - Crash reporter extensions (CrashReportExtension framework, `OS27`): process crashes at crash time with in-extension symbolication (Part 10) - MXMetricPayload / MXDiagnosticPayload parsing (legacy, iOS 13–26) - Field performance data collection - Integration with crash reporting ### Runtime Console Capture **Capture simulator console output** → `/axiom:console` - Capture print(), os_log(), Logger output from simulator - Structured JSON with level, subsystem, category - Bounded collection with `--timeout` and `--max-lines` - Filter by subsystem or regex ### Runtime State Inspection **LLDB interactive debugging** → See axiom-build (skills/lldb.md) - Set breakpoints, inspect variables at runtime - Crash reproduction from crash logs - Thread state analysis for hangs - Swift value inspection (po vs v) **LLDB command reference** → See axiom-build (skills/lldb-ref.md) - Complete command syntax - Breakpoint recipes - Expression evaluation patterns ## Decision Tree 1. Memory climbing + UI stutter/jank? → memory-debugging FIRST (memory pressure causes GC pauses that drop frames), then performance-profiling if memory is fixed but stutter remains 2. Memory leak (Swift)? → memory-debugging 3. Memory leak (Objective-C blocks)? → objc-block-retain-cycles 4. App hang/freeze — is UI completely unresponsive (can't tap, no feedback)? - YES → hang-diagnostics (busy vs blocked diagnosis) - NO, just slow → performance-profiling (Time Profiler) - First launch only? → Also check for synchronous I/O or lazy initialization in hang-diagnostics - Multiple grouped hang reports from Sentry/ASC (corpus, not single file)? → `axiom-shipping (skills/production-triage.md)` + `triage-analyzer` 5. Slowdown when multiple async operations complete at once? → Cross-route to `axiom-concurrency` (callback contention, not profiling) 6. Slow app launch / slow first frame / launch regression / slow after push tap? → app-launch 7. Battery drain (know the symptom)? → energy-diag 8. Battery drain (need API reference)? → energy-ref 9. Battery drain (general)? → energy 10. MetricKit setup/parsing? → metrickit-ref 10a. Metrics split by app state (per-tab hitch rate, experiment arms) or StateReporting? → metrickit-ref (Part 1) 10b. Profiling agentic/LLM features (Foundation Models instrument, token metrics)? → performance-profiling, then axiom-ai 10c. Building a crash reporter extension (process crashes at crash time)? → metrickit-ref (Part 10) 11. Profile with GUI (Instruments)? → performance-profiling 12. Profile with CLI (xctrace)? → xctrace-ref 13. Run automated profile now? → performance-profiler agent 14. General slow/lag? → performance-profiling 14a. Slow GRDB/SQLite queries (EXPLAIN QUERY PLAN, index design, cursors)? → See axiom-data (skills/grdb-performance.md) 15. Want proactive memory leak scan? → memory-auditor (Agent) 16. Want energy anti-pattern scan? → energy-auditor (Agent) 17. Want Swift performance audit (ARC, generics, collections)? → swift-performance-analyzer (Agent) 18. Need to inspect variable/thread state at runtime? → See axiom-build (skills/lldb.md) 19. Need exact LLDB command syntax? → See axiom-build (skills/lldb-ref.md) 20. Timer stops during scrolling? → timer-patterns (RunLoop mode) 21. EXC_BAD_INSTRUCTION crash with DispatchSourceTimer? → timer-patterns (4 crash patterns) 22. Choosing between Timer, DispatchSourceTimer, Combine timer, async timer? → timer-patterns 23. Need timer API syntax/lifecycle? → timer-patterns-ref 24. Code review for outdated Swift patterns? → swift-modern 25. Claude generating legacy APIs (DateFormatter, CGFloat, DispatchQueue)? → swift-modern 26. Need to see runtime console output before profiling? → axiom-tools (skills/xclog-ref.md) or `/axiom:console` 27. Have an `.ips`, MetricKit, or legacy `.crash` text file to symbolicate/triage? → axiom-tools (skills/xcsym-ref.md) or `/axiom:analyze-crash` ## Anti-Rationalization | Thought | Reality | |---------|---------| | "I know it's a memory leak, let me find it" | Memory leaks have 6 patterns. memory-debugging diagnoses the right one in 15 min vs 2 hours. | | "I'll just run Time Profiler" | Wrong Instruments template wastes time. performance-profiling selects the right tool first. | | "Battery drain is probably the network layer" | Energy issues span 8 subsystems. energy skill diagnoses the actual cause. | | "App feels slow, I'll optimize later" | Performance issues compound. Profiling now saves exponentially more time later. | | "It's just a UI freeze, probably a slow API call" | Freezes have busy vs blocked causes. hang-diagnostics has a decision tree for both. | | "Memory is climbing AND scrolling stutters — two separate bugs" | Memory pressure causes GC pauses that drop frames. Fix the leak first, then re-check scroll performance. | | "It only freezes on first launch, must be loading something" | First-launch hangs have 3 patterns: synchronous I/O, lazy initialization, main thread contention. hang-diagnostics diagnoses which. | | "Launch feels slow — I'll trim some startup code" | Launch has 3 phases (pre-main / main→first frame / extended) and a watchdog. app-launch tells you which phase to profile, with measurement hygiene so the number means something. | | "Launch is fine, it's f
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
77/100
Strong
Trust
61/100
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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"install_command": "npx skills add CharlesWiltgen/Axiom --skill axiom-performance",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "charleswiltgen-axiom-performance",
"task": "Use axiom-performance in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/charleswiltgen-axiom-performance",
"api": "https://www.openagentskill.com/api/agent/skills/charleswiltgen-axiom-performance",
"audit": "https://www.openagentskill.com/skills/charleswiltgen-axiom-performance/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=charleswiltgen-axiom-performance&task=Use%20axiom-performance%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20axiom-performance%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20axiom-performance%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/charleswiltgen-axiom-performance/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/charleswiltgen-axiom-performance"
}
}Listing source
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[](https://www.openagentskill.com/skills/charleswiltgen-axiom-performance/audit)
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/axiom:console.ips, MetricKit, or legacy .crash text file to symbolicate/triage? → axiom-tools (skills/xcsym-ref.md) or /axiom:analyze-crashCheck the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Audit
78/100
Needs review
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.