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This method in WarmUpJobDefinition.cs does not dispose sites and webs

void AwakeWebApplication(SPWebService webService, Guid webApplicationId)
        {
            // Creating thread for async work
            Thread webApplicationThread = new Thread(delegate(object param)
            {
                SPSiteCollection siteCollection = webService.WebApplications[(Guid)param].Sites;

                // Browsing all site collection of the WebApplication
                foreach (SPSite site in siteCollection)
                {
                    SPWebCollection webs = site.AllWebs;

                    // Browsing each web of the site
                    foreach (SPWeb web in webs)
                        AwakeURL(web.Url);
                }
            });

            // Start the thread
            webApplicationThread.Start(webApplicationId);
        }