Sitecore 9 Slow Startup

Since upgrading to Sitecore 9 we've noticed it takes a long time to load after dll or config updates. The tail of our log file looks like 

9224 09:00:24 WARN [Path Analyzer](.) SqlStorage ConnectionString 'reporting.secondary' cannot be found

ManagedPoolThread #3 09:00:28 INFO Job started: Sitecore.ContentSearch.SolrProvider.Agents.IndexingStateSwitcher
ManagedPoolThread #3 09:00:28 INFO Job ended: Sitecore.ContentSearch.SolrProvider.Agents.IndexingStateSwitcher (units processed: )
ManagedPoolThread #4 09:00:28 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #4 09:00:28 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #1 09:00:38 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #1 09:00:38 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #5 09:00:48 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #5 09:00:48 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #4 09:00:58 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #4 09:00:58 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #4 09:01:08 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #4 09:01:08 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #1 09:01:18 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #1 09:01:18 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #4 09:01:28 INFO Job started: Sitecore.ContentSearch.SolrProvider.Agents.IndexingStateSwitcher
ManagedPoolThread #4 09:01:28 INFO Job ended: Sitecore.ContentSearch.SolrProvider.Agents.IndexingStateSwitcher (units processed: )
ManagedPoolThread #3 09:01:28 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #3 09:01:28 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #5 09:01:38 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #5 09:01:38 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #1 09:01:48 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #1 09:01:48 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #4 09:01:58 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #4 09:01:58 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #4 09:02:08 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #4 09:02:08 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #1 09:02:18 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #1 09:02:18 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #3 09:02:28 INFO Job started: Sitecore.ContentSearch.SolrProvider.Agents.IndexingStateSwitcher
ManagedPoolThread #3 09:02:28 INFO Job ended: Sitecore.ContentSearch.SolrProvider.Agents.IndexingStateSwitcher (units processed: )
ManagedPoolThread #2 09:02:28 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #2 09:02:28 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #2 09:02:38 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #2 09:02:38 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #5 09:02:48 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #5 09:02:48 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #4 09:02:58 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #4 09:02:58 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #1 09:03:08 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #1 09:03:08 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #1 09:03:18 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #1 09:03:18 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #3 09:03:28 INFO Job started: Sitecore.ContentSearch.SolrProvider.Agents.IndexingStateSwitcher
ManagedPoolThread #3 09:03:28 INFO Job ended: Sitecore.ContentSearch.SolrProvider.Agents.IndexingStateSwitcher (units processed: )
ManagedPoolThread #4 09:03:28 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #4 09:03:28 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #3 09:03:38 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #3 09:03:38 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )
ManagedPoolThread #3 09:03:48 INFO Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #3 09:03:48 INFO Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent (units processed: )

Any ideas what's going on? This is happening on multiple development machines that have been updated from 8.1 update 1 to 9.0 update 1