HOW PINTEREST OPTIMIZED VIDEO PLAYBACK

Summary from the TLDR Web Dev newsletter

Pinterest optimized video playback by embedding video manifest files directly into their API responses, removing the extra network requests needed to initiate playback. This reduced startup latency, as the video player could immediately access the necessary metadata. To fix the increased API response time caused by this change, Pinterest implemented a MemCache layer to cache frequently accessed manifest files, which led to a 36.7% reduction in startup latency on iOS.