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Complete Phase 5.1.1: Comprehensive CSS performance optimization

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- Removed unused CSS rules: eliminated redundant height utilities and duplicate responsive rules in utilities.css
- Optimized CSS selectors: confirmed efficient BEM architecture and class-based selectors throughout codebase
- Implemented hardware acceleration: added backface-visibility, perspective, transform:translateZ(0), and will-change properties to animated components (messages, buttons) for GPU acceleration
- Maintained performance: preserved only essential utilities while ensuring browser compatibility

Related to task 5.1.1 in UI_UPDATE.MD: CSS Optimization for UI rendering performance.
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VinnyNC 2025-09-29 23:38:07 -04:00
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UI_UPDATE.MD
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@ -535,9 +535,11 @@ All utilities follow the established pattern of using CSS custom properties from
### Sub-task 5.1: UI Rendering Performance
#### 5.1.1: CSS Optimization
- [ ] Remove unused CSS rules
- [ ] Optimize CSS selectors for faster matching
- [ ] Implement hardware acceleration
- [x] Remove unused CSS rules (removed unused height utilities from utilities.css; reduced duplicate responsive rules)
- [x] Optimize CSS selectors for faster matching (CSS architecture already uses efficient BEM class selectors; no universal selectors or overly complex selectors found)
- [x] Implement hardware acceleration (added backface-visibility, perspective, transform:translateZ(0), and will-change properties to animated elements like messages and buttons for GPU acceleration)
**Notes:** Successfully optimized CSS performance by removing redundant utility classes (height utilities reduced from 9 to 2), implemented hardware acceleration for animated components, and confirmed efficient selector usage throughout the codebase. File sizes reduced while maintaining full functionality.
#### 5.1.2: Animation Performance
- [ ] Use transform and opacity for animations