Babysitter startup-time-profiler

Profile and optimize application startup time for desktop applications

install

source · Clone the upstream repo

git clone https://github.com/a5c-ai/babysitter

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/a5c-ai/babysitter "$T" && mkdir -p ~/.claude/skills && cp -r "$T/library/specializations/desktop-development/skills/startup-time-profiler" ~/.claude/skills/a5c-ai-babysitter-startup-time-profiler && rm -rf "$T"

manifest: library/specializations/desktop-development/skills/startup-time-profiler/SKILL.md

startup-time-profiler

Profile and optimize application startup time, identifying bottlenecks in initialization, module loading, and rendering.

Capabilities

Measure cold and warm start times
Identify module loading bottlenecks
Profile initialization phases
Generate timeline visualizations
Provide optimization recommendations
Set up CI performance tracking

Input Schema

{
  "type": "object",
  "properties": {
    "projectPath": { "type": "string" },
    "framework": { "enum": ["electron", "tauri", "native"] },
    "iterations": { "type": "number", "default": 5 }
  },
  "required": ["projectPath"]
}

Electron Startup Profiling

// Add to main.js
const startTime = Date.now();

app.on('ready', () => {
  console.log(`App ready: ${Date.now() - startTime}ms`);
});

// Enable tracing
app.commandLine.appendSwitch('trace-startup');
app.commandLine.appendSwitch('trace-startup-file', 'startup-trace.json');

Optimization Techniques

Lazy load modules
Defer non-critical initialization
Optimize bundle size
Use V8 snapshots
Preload critical resources

Benchmarks

Metric	Good	Acceptable	Poor
Cold start	< 2s	< 4s	> 6s
Warm start	< 1s	< 2s	> 3s
Window visible	< 1.5s	< 3s	> 5s

Related Skills

```
memory-leak-detector
```
```
bundle-size-analyzer
```