LiveKit 1.0 is an open-source WebRTC stack that aims to provide end-to-end optimizations for video conferencing software. It includes adaptive stream, a subscriber-side feature that automatically adjusts the resolution and frame rate of video elements based on their size and visibility. Additionally, it offers dynamic broadcast, a publisher-side feature that conserves upstream bandwidth by monitoring how subscribers consume a publisher's video and adjusting upload characteristics accordingly. LiveKit also provides congestion control through its StreamAllocator controller, which determines the available bandwidth and decides how to forward data to a subscriber efficiently. These features work together seamlessly to ensure high-quality video and audio in large meetings with minimal scaling concerns.