December 2024 performance and impact summary: Delivered end-to-end Content Blocking Compilation Performance Tracking across Apple Browsers and the macOS Browser, enabling observable metrics for compilation time, iteration counts, and time bucket aggregations. Upgraded critical dependencies to 220.0.0 to support metrics collection. Implementations establish a foundation for data-driven optimizations and improved user experience by reducing compilation overhead during startup and content-blocking initialization; demonstrated cross-repo coordination and strong observability improvements.

November 2024 performance summary: Delivered cross‑platform telemetry enhancements for content blocking, improving observability and reliability. Implemented new tracking pixels to capture success/failure of content blocking rule lookups and fetches, expanded error reporting to cover rule availability and matching events (including LRC fetch outcomes and missing LRC). Updated BrowserServicesKit dependencies to align with latest features and fixes. Work spanned two repositories (duckduckgo/apple-browsers and duckduckgo/macos-browser), establishing a stronger data‑driven foundation for performance improvements and user privacy protections.