Issue
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Jenkins UI is slow to render or times-out (hangs) completely
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You see slow requests and/or threads waiting with the following stacktraces:
[...] hudson.security.ACL.hasPermission(ACL.java:75) hudson.model.AbstractItem.hasPermission(AbstractItem.java:512) hudson.model.Items.getAllItems(Items.java:378) hudson.model.Items.getAllItems(Items.java:383) hudson.model.Items.getAllItems(Items.java:383) hudson.model.Items.getAllItems(Items.java:383) hudson.model.Items.getAllItems(Items.java:383) hudson.model.Items.getAllItems(Items.java:383) hudson.model.Items.getAllItems(Items.java:383) hudson.model.Items.getAllItems(Items.java:359) jenkins.model.Jenkins.getAllItems(Jenkins.java:1753) com.cloudbees.jenkins.plugins.securecopy.ExportsRootAction.getIconFileName(ExportsRootAction.java:52) [...]
Resolution
Remove or disable the CloudBees Secure Copy plugin. If you are using it, consider replacing it with Cluster-wide copy artifacts.