This document discusses how tag management can help optimize website performance. It begins by explaining different metrics for measuring performance like total page load time, page render time, and above the fold time. It then discusses how tag management helps by enabling informed trade-offs when deploying tags, making tags asynchronous to avoid blocking rendering, and standardizing the deployment process. The document also covers underlying technical details that affect performance like network traffic and rendering processes. It provides general tips like quantifying performance issues and testing components separately. Finally, it outlines how a tag management system like Ensighten can help by centralizing third-party content deployment and standardizing best practices.