Hot Path is the most expensive call path based on either sample count ( Sampling Profiling ) or execution times ( Instrumentation profiling ) . Hot Path shows the branch of your application’s call tree with the highest inclusive samples or inclusive time.
Hot path is default available in Profiler summary report as shown in below.
You can highlight the Hot path from Call Tree as well. Call tree will be collection of all the call items that has been collected during profiling. Visual Studio 2010 profiler tool allows to highlight the Hot Path in Call Tree view as well. In Call Tree View, you will find one icon “Expand Hot Path”
Click on that, it will automatically expand the complete call path ( Hot Path)
You can also highlight Hot Path from Analyze > Profiler > Expand Hot Path
“The Expand Hot Path” is only available with Call Tree View.
Hope this helps !