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I see a huge overhead in: - MIMEResolverImpl$Impl.findMIMEType - why file system try to resolve mime type of known file? "Load Open Projects" daemon prio=2 tid=0x5260a000 nid=0x13c8 runnable [0x54efe000..0x54effa14] java.lang.Thread.State: RUNNABLE at java.io.WinNTFileSystem.getBooleanAttributes(Native Method) at java.io.File.isFile(File.java:778) at org.netbeans.modules.masterfs.filebasedfs.utils.FileInfo.isFile(FileInfo.java:102) at org.netbeans.modules.masterfs.filebasedfs.utils.FileInfo.isUNCFolder(FileInfo.java:151) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.getNameExt(BaseFileObj.java:139) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.getNameExt(BaseFileObj.java:117) at org.openide.filesystems.FileObject.constructName(FileObject.java:274) at org.openide.filesystems.FileObject.constructName(FileObject.java:270) at org.openide.filesystems.FileObject.constructName(FileObject.java:270) at org.openide.filesystems.FileObject.constructName(FileObject.java:270) at org.openide.filesystems.FileObject.constructName(FileObject.java:270) at org.openide.filesystems.FileObject.constructName(FileObject.java:270) at org.openide.filesystems.FileObject.constructName(FileObject.java:270) at org.openide.filesystems.FileObject.constructName(FileObject.java:270) at org.openide.filesystems.FileObject.constructName(FileObject.java:270) at org.openide.filesystems.FileObject.constructName(FileObject.java:270) at org.openide.filesystems.FileObject.getPath(FileObject.java:188) at org.netbeans.modules.openide.filesystems.declmime.MIMEResolverImpl$Impl.findMIMEType(MIMEResolverImpl.java:144) at org.openide.filesystems.MIMESupport$CachedFileObject.resolveMIME(MIMESupport.java:290) at org.openide.filesystems.MIMESupport$CachedFileObject.getMIMEType(MIMESupport.java:278) at org.openide.filesystems.MIMESupport.findMIMEType(MIMESupport.java:124) at org.openide.filesystems.FileUtil.getMIMETypeOrDefault(FileUtil.java:1134) at org.openide.filesystems.FileObject.getMIMEType(FileObject.java:489) at org.openide.loaders.DataLoaderPool.allLoaders(DataLoaderPool.java:328) at org.openide.loaders.DataLoaderPool.findDataObject(DataLoaderPool.java:477) at org.openide.loaders.DataLoaderPool.findDataObject(DataLoaderPool.java:440) at org.openide.loaders.DataObject.find(DataObject.java:492) at org.netbeans.modules.cnd.makeproject.api.configurations.Item.getDataObject(Item.java:281) at org.netbeans.modules.cnd.makeproject.api.configurations.Item.addPropertyChangeListener(Item.java:175) at org.netbeans.modules.cnd.makeproject.api.configurations.Item.setFolder(Item.java:170) at org.netbeans.modules.cnd.makeproject.api.configurations.Folder.addItem(Folder.java:258) at org.netbeans.modules.cnd.makeproject.api.configurations.Folder.addItem(Folder.java:244) at org.netbeans.modules.cnd.makeproject.configurations.ConfigurationXMLCodec.endElement(ConfigurationXMLCodec.java:418) at org.netbeans.modules.cnd.api.xml.XMLDecoder.checkEndRecursion(XMLDecoder.java:155) at org.netbeans.modules.cnd.api.xml.XMLDecoder._endElement(XMLDecoder.java:114) at org.netbeans.modules.cnd.api.xml.XMLDocReader$Parser.endElement(XMLDocReader.java:267) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1772) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl. java:2923) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:647) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:508) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522) at org.netbeans.modules.cnd.api.xml.XMLDocReader.read(XMLDocReader.java:133) at org.netbeans.modules.cnd.makeproject.configurations.ConfigurationXMLReader.read(ConfigurationXMLReader.java:108) at org.netbeans.modules.cnd.makeproject.api.configurations.ConfigurationDescriptorProvider.getConfigurationDescriptor(ConfigurationD escriptorProvider.java:95) - locked <0x08937050> (a java.lang.Object) at org.netbeans.modules.cnd.makeproject.ui.MakeLogicalViewProvider.getMakeConfigurationDescriptor(MakeLogicalViewProvider.java:777) at org.netbeans.modules.cnd.makeproject.ui.MakeLogicalViewProvider.createLogicalView(MakeLogicalViewProvider.java:152) at org.netbeans.modules.project.ui.ProjectsRootNode$ProjectChildren.logicalViewForProject(ProjectsRootNode.java:300) at org.netbeans.modules.project.ui.ProjectsRootNode$BadgingNode.propertyChange(ProjectsRootNode.java:652) at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:186) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339) at org.netbeans.modules.project.ui.OpenProjectList$LoadOpenProjects.loadOnBackground(OpenProjectList.java:352) at org.netbeans.modules.project.ui.OpenProjectList$LoadOpenProjects.run(OpenProjectList.java:270) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)
I did some performance improvements together with issue 137734. Please, try latest daily build and if problems persists, re-open issue and provide testing project or snapshot from profiler. Thanks.
As I understand within http://www.netbeans.org/issues/show_bug.cgi?id=137734 you have introduced FileUtil.getMIMEType to pass mime-types may be you need to introduce same method in DataObject to speed up clients: DataObject.find(fo, String... withinMIMETypes)
There were also improvements in the code not related directly to the new method. It should be faster even without changes in your code. If you want to benefit from the new method, you can firstly filter FileObjects by their MIME type and then create DataObject only for filtered ones.