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Created attachment 149383 [details] full thread dump If refreshing of a file is slow (which can always be the case on remote systems), then NetBeans UI freezes for a long time. Even though refresh is done in a separate thread, it locks document; at the same time UndoRedoManager tries to get lock on this document in EDT. So EDT is blocked until file refresh is done. Here are 2 threads of interest, the full thread dump is in the attachment. "AWT-EventQueue-0" prio=10 tid=0x00007fd2c00c7800 nid=0x20a1 in Object.wait() [0x00007fd30592b000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000eb9ee800> (a org.netbeans.modules.editor.NbEditorDocument) at java.lang.Object.wait(Object.java:503) at javax.swing.text.AbstractDocument.readLock(AbstractDocument.java:1387) - locked <0x00000000eb9ee800> (a org.netbeans.modules.editor.NbEditorDocument) at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1389) at org.openide.text.UndoRedoManager$DocLockedRun.<init>(UndoRedoManager.java:634) at org.openide.text.UndoRedoManager.canUndo(UndoRedoManager.java:448) at org.netbeans.core.multiview.MultiViewPeer$DelegateUndoRedo.canUndo(MultiViewPeer.java:1098) at org.openide.actions.UndoRedoAction.run(UndoRedoAction.java:157) at org.openide.actions.UndoRedoAction.propertyChange(UndoRedoAction.java:252) at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:197) at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263) at org.netbeans.core.windows.RegistryImpl.doFirePropertyChange(RegistryImpl.java:329) at org.netbeans.core.windows.RegistryImpl.access$100(RegistryImpl.java:69) at org.netbeans.core.windows.RegistryImpl$1.run(RegistryImpl.java:170) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733) at java.awt.EventQueue.access$200(EventQueue.java:103) .... "org.openide.text Document Processing" daemon prio=10 tid=0x00007fd2dc021000 nid=0x25c4 runnable [0x00007fd288851000] java.lang.Thread.State: RUNNABLE at org.netbeans.modules.remote.impl.fs.RemoteDirectory.refreshImpl(RemoteDirectory.java:1591) at org.netbeans.modules.remote.impl.fs.RemotePlainFile.refreshImpl(RemotePlainFile.java:442) at org.netbeans.modules.remote.impl.fs.RemoteFileObjectBase.refresh(RemoteFileObjectBase.java:543) at org.netbeans.modules.remote.impl.fs.RemoteFileObject.refresh(RemoteFileObject.java:262) at org.openide.text.DataEditorSupport$Env$1.run(DataEditorSupport.java:916) at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127) at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:641) at org.openide.text.DataEditorSupport$Env.getTime(DataEditorSupport.java:920) at org.openide.text.CloneableEditorSupport.updateLastSaveTime(CloneableEditorSupport.java:2083) at org.openide.text.DocumentOpenClose$DocumentLoad.atomicLockedRun(DocumentOpenClose.java:779) at org.openide.text.DocumentOpenClose$DocumentLoad.run(DocumentOpenClose.java:613) at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:323) at org.openide.text.NbDocument.runAtomic(NbDocument.java:436) at org.openide.text.DocumentOpenClose$DocumentLoad.run(DocumentOpenClose.java:653) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)