This post is the third in a series about building custom video chat applications that support large meetings using the Daily call object. The features added specifically target use cases where dozens (or hundreds!) of participants in an up to 1000 person call might be turning on their cameras. WebRTC simulcast allows multiple resolutions, bitrates, and frame rates to be sent from a single source track, with the SFU deciding which layer to forward based on network quality. The Daily receiveSettings API is used to request specific simulcast encoding settings to preserve participant bandwidth and CPU on large calls. A practical use case is adding dynamic simulcast encoding to a participant video grid, where lower quality videos save downstream bandwidth and impact CPU performance. The final feature introduces selective simulcast encoding to the React app, updating the app logic to request a specific track layer based on the number of visible participants.