When you register a method for exceptional method recording, a few of the slowest invocations will be retained separately in the call tree. The other invocations will be merged into a single method node as usual. The number of separately retained invocations can be configured in the profiling settings, by default it is set to 5.
When discriminating slow method invocations, a certain thread state can be used for the time measurement. By default, the wall clock time (all thread states) is used, but a different thread status can be configured in the profiling settings. Note that the thread status selection in the CPU views is not used in this case, but the separate setting in the profiling settings is used.
The context menu for the list of methods offers the option to edit existing entries.