There are multiple ways and wider approach for troubleshooting the Splunk performance issue, for interview point of view below details can be covered:  Navigate to splunkd.log and check for any kind of errors  Server performance issues needs to be checked such as CPU or memory usage, disk i/o, etc  Install Splunk on Splunk (SOS) app and check for warnings and errors in the dashboard  The number of saved searches can also be helpful in checking the currently running and their system resource consumption, which further on helps in Splunk troubleshooting issues.  Firebug (which is a Firefox extension) installation is also helpful. Once it is installed and enabled, log into Splunk (using Firefox), open firebug panels, and switch to the ‘Net’ panel (where you will have to enable it). The Net panel will show us the details about HTTP requests and responses along with the time spent on each.   From this we can have insights about a lot of information quickly over requests that are hanging Splunk for a few seconds etc.