This document discusses various tools for analyzing JavaScript performance. It introduces Kojak, a tool for measuring JavaScript function performance, and jsPro, a visualization tool that works with Kojak. It provides instructions on how to use Kojak to track function call times and counts. It also explains how Kojak can be integrated with jsPro for online visualization of profiling data. Other profiling tools mentioned include Chrome Dev Tools, Google Analytics, AppDynamics, and PageSpeed Insights.