In this session, I will cover the rendering and state management challenges specific to agentic UIs, drawing from production experience and from a public benchmark I built to measure rendering strategies under real agent event streams.

The session will address three areas. First, state architecture: how partial and final text differ as state shapes, why conventional Redux patterns struggle with high-frequency token streams, and what alternatives exist. Second, implementation tradeoffs: when a streaming library is justified, when a custom buffering layer is the better choice, I will demonstrate these comparisons through live coding, with performance measurements for each approach. Third, standards: what the AG-UI protocol currently specifies for agent-to-UI communication, and where it leaves decisions to the implementer.

Attendees will leave with a clear framework for choosing a rendering strategy, and access to the open benchmark to evaluate their own applications.