I am having some performance issues caused presumably by Umbraco.Web.Scheduling.BackgroundTaskRunner. I noticed the issues in the following curcimstances: I run profiler and simulated some load (50 simultaneous requests at a time made by JMeter) - the site became very slow and finally stopped responding. After that the profiler shown me the following report As you can see, 18.2% of all the time is being taked by Umbraco.Web.Scheduling.BackgroundTaskRunner (there are another issues in the request processing but this is out of the topic scope). All the time that is taken by BackgroundTaskRunner has been spent for waiting. What could be the reason of this? What is the role of BackgroundTaskRunner? I have no any tasks in umbracoSettings.config <scheduledTasks> section.