Use these to check for apps or devices that are taking a longer than than normal time to execute. Use the enable link to begin stat collection, the stats link to view the results, and disable when you're done. Don't forget to turn the stats off.
http://hubitat.local/hub/stats http://hubitat.local/hub/enableStats http://hubitat.local/hub/disableStats
You can use this to monitor mesh performance.
If you want to get down in the weeds you could run something like Hubigraph.