May 2025 monthly summary for facebook/litho: Delivered a rendering optimization feature for LazyGrid to better handle large datasets, focusing on user-perceived performance and smooth scrolling. Implemented an estimatedViewportCount parameter to refine item rendering, and exposed the useEstimatedViewCount API for LazyGrid via commit 4d395d55091b2e833dd59a5a91bbe5590725edfe. This work reduces unnecessary renders, improves first paint and scroll stability on large feeds, and demonstrates capability in performance-focused UI enhancements.

April 2025 highlights for facebook/fresco: Implemented Content Resolver Thumbnail Loading Prioritization to speed up thumbnail generation for images from content providers by updating the image pipeline configuration and producer factory to support this behavior. The changes include swapping the thumbnail API order to favor content resolver paths, resulting in faster and more predictable thumbnail rendering in media-rich UIs. This work establishes a solid foundation for future performance optimizations and aligns the data path with content provider data characteristics, delivering measurable business value in improved user-perceived performance.