TraViz is an interactive visualization tool for exploring and analysing distributed traces to troubleshoot and debug performance problems in distributed systems. Through the use of composite filtering of multiple dimensions of the dataset, TraViz provides developers an easy to use way to nd outlier traces. With TraViz’s traceview swimlane idiom, the users can drill down into a single trace to analyze the trace for performance issues at the detail level of an operating system thread. TraViz’s comparison idiom allows users to compare the Graphical structure of 2 traces of interest to highlight the key differences between the traces. The aggregation idiom allows users to nd uncommon occurring events across traces by constructing a luminance coded super graph of all the distributed traces. Additionally, TraViz is the rst visualization tool that provides an integrated view of the static source code of the system with dynamic information collected about the system via distributed traces which can help the users in identifying locations in the source code that would be ideal for performance optimizations.