# Bundle Size Analysis & Optimization Roadmap

**Date:** 2026-03-03
**Current Main Bundle:** 773KB (126KB gzipped)

## Bundle Breakdown

| Asset | Uncompressed | Gzipped | Status |
|-------|--------------|---------|--------|
| Main bundle | 773 KB | 126 KB | ⚠️ Large |
| TipTap editor | 834 KB | 277 KB | ⚠️ Lazy-loadable |
| Syntax highlighting | 620 KB | 222 KB | ⚠️ Lazy-loadable |
| Markdown renderer | 434 KB | 131 KB | ⚠️ Lazy-loadable |
| KaTeX fonts | 633 KB total | N/A | ⚠️ Lazy-loadable |
| State management | 32 KB | 11 KB | ✅ Good |
| CSS | 223 KB | 39 KB | ✅ Good |

## What Causes 4-5 Second Delay?

1. **Download time** (depends on network, minimal for local Electron app)
2. **JavaScript parsing** (~1.5-2s for 773KB on average CPU)
3. **React initialization** (~0.5-1s)
4. **Component mounting** (~0.5-1s)

**Total:** 4-5 seconds from window open to UI visible

## Immediate Fix ✅ (DONE)

**Static HTML loading screen** - Instant visual feedback while JavaScript loads
- Matches Liquid Glass UI aesthetic
- Uses actual Paprwork logo
- Provides loading animation
- **Result:** User perceives instant startup (delay is masked)

## Future Optimizations (Post-V2.0)

### Phase 1: Code Splitting (High Impact)

Split large dependencies into separate chunks loaded on-demand:

```typescript
// Lazy load TipTap editor (834KB saved from main bundle!)
const DocumentEditor = lazy(() => import('./components/Documents/DocumentEditor'));

// Lazy load syntax highlighter (620KB saved!)
const CodeBlock = lazy(() => import('./components/common/CodeBlock'));

// Lazy load markdown renderer (434KB saved!)
const MarkdownRenderer = lazy(() => import('./components/common/Markdown'));
```

**Estimated savings:** Main bundle 773KB → ~250KB (68% reduction!)
**Estimated load time:** 4-5s → 1-2s

### Phase 2: Dynamic Imports for Fonts

KaTeX fonts (633KB) can be loaded on-demand when math content appears:

```typescript
// Only load KaTeX when needed
if (content.includes('$$') || content.includes('\\(')) {
  await import('katex/dist/katex.css');
}
```

### Phase 3: Tree Shaking

Analyze and remove unused code:
- Use `rollup-plugin-visualizer` to identify bloat
- Replace large libraries with smaller alternatives
- Remove unused exports

### Phase 4: Preload Critical Resources

```html
<link rel="preload" href="/assets/index-BTRo2vaF.js" as="script">
<link rel="preload" href="/assets/index-C_UcXJIB.css" as="style">
```

## Why Not Do This Now?

1. **User experience is fixed** - Loading screen masks delay effectively
2. **Code splitting adds complexity** - Need careful error boundaries, Suspense wrappers
3. **V2 focus is features** - SQLite persistence, memory indexing, OAuth
4. **Optimization is premature** - Better to optimize once we know usage patterns

## When to Optimize?

- Post V2.0 release
- When bundle exceeds 1MB (currently 773KB)
- When users on slow hardware report issues
- When profiling shows parse time is bottleneck

---

**Status:** Issue RESOLVED via instant loading screen. Further optimization planned for V2.1+
