KCachegrind visualizes traces generated by profiling, including a tree map and a call graph visualization of the calls happening. It's designed to be fast for very large programs like KDE applications.
I don't know of another tool in its class (displaying and visualizing profile data) that comes anywhere close to this tool. It also produces nicer dot graphs for export than tools that do just that.
Excellent tool.Very handy. Would need volunteers to enhance it and fix bugs, yet :-)
Hope to see it ported on Windows on day