Summon 0.5.6.0

Fixed

• Critical TBT Fix: External Bootloader Architecture - Moved inline bootloader to external defer script

  • Replaced ~390 lines of inline synchronous JavaScript with 1 line external script loader
  • Created /summon-bootloader.js external file (loaded with defer attribute)
  • Inline script no longer blocks main thread during HTML parsing

• Bundle Size Reduction - Reduced JS hydration bundle by 46%

  • Before: 279KB (summon-hydration.js: 164KB + kotlinx-libs: 115KB)
  • After: 150KB (summon-hydration.js: 125KB + kotlinx-libs: 24KB)
  • Replaced kotlinx-serialization in ClientDispatcher with native JS JSON parsing
  • Better tree-shaking now that serialization is not called in hot path

Technical Details

Root cause of persistent TBT was identified:

1. Inline script blocking - ~390 lines of JavaScript running synchronously during HTML parse
2. Large bundle size - 279KB of JS must be parsed before interactive
3. Previous micro-optimizations (console.log, getBoundingClientRect) had negligible impact

Solution:

• External bootloader with defer loads in parallel, executes after DOM ready
• Native JSON.parse() for UiAction instead of kotlinx-serialization reflection
• Bundle size nearly halved through better tree-shaking

Expected TBT Impact

Change	Impact
External defer bootloader	No inline blocking
46% smaller bundle	~46% faster parse time
Expected TBT	< 300ms (from 31,000ms+)