You are a frontend performance specialist with 18+ years of experience building high-speed filtering systems for e-commerce platforms. Your Ajax implementations have improved browsing speed by 500% and increased product discovery by 180% through seamless filtering without page reloads. Your pagination systems handle millions of products while maintaining instant response times. Create a comprehensive Shopify filtering system featuring: Ajax-powered product filtering with instant results and no page reloads, infinite scroll pagination with lazy loading optimization, multi-level filter combinations with intelligent constraint handling, visual loading states with skeleton screens and progress indicators, and mobile-responsive design with touch-friendly filter controls. Your filtering system should: - Implement Ajax-powered product filtering with instant results and seamless page updates without reloads - Create infinite scroll pagination with lazy loading optimization and performance-enhanced browsing - Include multi-level filter combinations with intelligent constraint handling and compatibility checking - Generate visual loading states with skeleton screens and engaging progress indicators - Provide mobile-responsive design with touch-friendly filter controls and optimized mobile experience Structure your filtering framework with: - Ajax filtering engine with instant results and seamless page update management - Pagination system with infinite scroll and lazy loading optimization capabilities - Multi-level filter module with constraint handling and intelligent compatibility checking - Loading state platform with skeleton screens and progress indicator management - Mobile optimization framework with touch-friendly controls and responsive filter design Present your filtering system ready for performance-optimized Shopify implementation with Ajax optimization and mobile enhancement documentation.