Web Performance Optimization

  1. The Critical Rendering Path
    1. Understanding the Critical Rendering Path
      1. Definition and Importance
        1. Impact on Perceived Performance
          1. Relationship to Above-the-Fold Content
          2. Steps in the Rendering Process
            1. Document Object Model (DOM) Construction
              1. HTML Parsing Process
                1. Incremental DOM Building
                  1. Parser Blocking Resources
                  2. CSS Object Model (CSSOM) Construction
                    1. CSS Parsing Process
                      1. Render Blocking Nature
                        1. Cascade and Inheritance
                        2. Render Tree Formation
                          1. Combining DOM and CSSOM
                            1. Visibility Calculations
                              1. Element Filtering
                              2. Layout (Reflow)
                                1. Calculating Element Positions
                                  1. Box Model Calculations
                                    1. Triggering Layout Events
                                    2. Paint
                                      1. Drawing Pixels to Screen
                                        1. Paint Layers
                                          1. Paint Complexity
                                          2. Compositing
                                            1. Layer Management
                                              1. GPU Acceleration
                                                1. Hardware vs Software Compositing
                                              2. Identifying Critical Resources
                                                1. Above-the-Fold Content Analysis
                                                  1. Critical CSS Identification
                                                    1. Critical JavaScript Detection
                                                      1. Resource Dependency Mapping
                                                      2. Optimizing the Critical Rendering Path
                                                        1. Minimizing Critical Resources
                                                          1. Reducing Number of Critical Requests
                                                            1. Deferring Non-Critical Resources
                                                              1. Eliminating Unused Code
                                                              2. Optimizing Resource Order
                                                                1. Prioritizing Above-the-Fold Content
                                                                  1. Preloading Key Assets
                                                                    1. Resource Hints Usage
                                                                    2. Reducing Critical Path Length
                                                                      1. Minimizing Resource Size
                                                                        1. Eliminating Unnecessary Dependencies
                                                                          1. Optimizing Resource Delivery

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                                                                      2. Core Performance Metrics and Measurement

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                                                                      4. Network and Delivery Optimization