When using the Traces Perspective in live mode, you are constantly polling for the slowest traces in your time range selection. However, in a large IT infrastructure with constant requests being traced, your slowest traces right now might not be your slowest traces in a matter of seconds, changing their position the list. These constant updates to the order of the list could become frustrating, for example, if you are inspecting a trace/span, or scrolling through the list to look for a specific trace or pattern.