The Linux `perf` GUI tool is praised for its ability to facilitate performance analysis by allowing users to identify bottlenecks in codebases effortlessly. User comments highlight its user-friendly interface and effective integration with other development tools like QtCreator, making it easy to navigate from performance hotspots directly to the relevant code. Additionally, features like automatic linking enhance the usability and efficiency of debugging and performance optimization. Another related tool, Heaptrack, is mentioned for investigating memory usage, pointing to a suite of tools that aid in performance optimization on Linux systems. The overall feedback underscores the importance of these tools in streamlining the development process and improving code quality.