A comprehensive checklist covering frontend performance optimization techniques for 2025, including HTML optimization, CSS best practices, JavaScript management, image and video handling, font optimization, and server configuration. The guide emphasizes the business impact of performance, with statistics showing that faster sites see higher conversion rates and better user engagement. Key areas covered include lazy loading, modern image formats like WebP/AVIF, code splitting, CDN usage, and Core Web Vitals optimization. The checklist is platform-agnostic and provides actionable steps for developers to build faster web applications.