Timing Side-Channel Profiler (TSP) is a specialized Chrome extension designed for developers and security professionals. This tool focuses on identifying timing anomalies and performance issues within web applications. With features that allow monitoring of fetch() and XMLHttpRequest timings, TSP provides critical insights into resource loading metrics such as DNS resolution, connection times, redirects, and responses. Additionally, it tracks key paint events, including the first paint and first contentful paint, which are essential for assessing user experience and performance.

TSP also offers controlled active probing, enabling users to compare response times across different endpoints by opting in to specific tests. Results can be exported for further analysis in formats like JSON, making it easier to integrate findings into other tools like Jupyter notebooks. Designed strictly for local use, TSP does not collect or transmit any personal data, ensuring user privacy while enabling a thorough exploration of potential timing-based vulnerabilities and performance bottlenecks.