First fix for indexing slowness.

pkg/analyzer/lib/src/generated/source_io.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.source.io;
 
 import 'source.dart';
@@ skipping 76 matching lines @@
    * The URI from which this source was originally derived.
    */
   final Uri uri;
 
   /**
    * The file represented by this source.
    */
   final JavaFile file;
 
   /**
+   * The cached absolute path of this source.
+   */
+  String _absolutePath;
+
+  /**
    * The cached encoding for this source.
    */
   String _encoding;
 
   /**
    * Initialize a newly created source object.
    *
    * @param file the file represented by this source
    */
   FileBasedSource.con1(JavaFile file) : this.con2(file.toURI(), file);
@@ skipping 24 matching lines @@
 
   @override
   String get encoding {
     if (_encoding == null) {
       _encoding = uri.toString();
     }
     return _encoding;
   }
 
   @override
-  String get fullName => file.getAbsolutePath();
+  String get fullName {
+    if (_absolutePath == null) {
+      _absolutePath = file.getAbsolutePath();
+    }
+    return _absolutePath;
+  }
 
   @override
   int get modificationStamp => file.lastModified();
 
   @override
   String get shortName => file.getName();
 
   @override
   UriKind get uriKind {
     String scheme = uri.scheme;
@@ skipping 350 matching lines @@
       for (JavaFile dir in _relativeDirectories) {
         JavaFile file = new JavaFile.relative(dir, filePath);
         if (file.exists()) {
           return new FileBasedSource.con2(uri, file);
         }
       }
     }
     return null;
   }
 }