Huge improvement to InsertDocument() efficienty. Using set operations to find the missing refs.

DocX/Container.cs

                 Uri style_package_uri = new Uri("/word/styles.xml", UriKind.Relative);
                 if (!Document.package.PartExists(style_package_uri))
                 {
-                    PackagePart style_package = Document.package.CreatePart(style_package_uri, "application/vnd.openxmlformats-officedocument.wordprocessingml.styles+xml");
+                    PackagePart style_package = Document.package.CreatePart(style_package_uri, "application/vnd.openxmlformats-officedocument.wordprocessingml.styles+xml", CompressionOption.Maximum);
                     using (TextWriter tw = new StreamWriter(style_package.GetStream()))
                     {
                         style_document = new XDocument

DocX/HelperFunctions.cs

     {
         internal static void CreateRelsPackagePart(DocX Document, Uri uri)
         {
-            PackagePart pp = Document.package.CreatePart(uri, "application/vnd.openxmlformats-package.relationships+xml");
+            PackagePart pp = Document.package.CreatePart(uri, "application/vnd.openxmlformats-package.relationships+xml", CompressionOption.Maximum);
             using (TextWriter tw = new StreamWriter(pp.GetStream()))
             {
                 XDocument d = new XDocument
             Uri settingsUri = new Uri("/word/settings.xml", UriKind.Relative);
             if (!package.PartExists(settingsUri))
             {
-                settingsPart = package.CreatePart(settingsUri, "application/vnd.openxmlformats-officedocument.wordprocessingml.settings+xml");
+                settingsPart = package.CreatePart(settingsUri, "application/vnd.openxmlformats-officedocument.wordprocessingml.settings+xml", CompressionOption.Maximum);
 
                 PackagePart mainDocumentPart = package.GetParts().Where
                 (
 
         internal static void CreateCustomPropertiesPart(DocX document)
         {
-            PackagePart customPropertiesPart = document.package.CreatePart(new Uri("/docProps/custom.xml", UriKind.Relative), "application/vnd.openxmlformats-officedocument.custom-properties+xml");
+            PackagePart customPropertiesPart = document.package.CreatePart(new Uri("/docProps/custom.xml", UriKind.Relative), "application/vnd.openxmlformats-officedocument.custom-properties+xml", CompressionOption.Maximum);
 
             XDocument customPropDoc = new XDocument
             (
         {
             XDocument stylesDoc;
             // Create the main document part for this package
-            PackagePart word_styles = package.CreatePart(new Uri("/word/styles.xml", UriKind.Relative), "application/vnd.openxmlformats-officedocument.wordprocessingml.styles+xml");
+            PackagePart word_styles = package.CreatePart(new Uri("/word/styles.xml", UriKind.Relative), "application/vnd.openxmlformats-officedocument.wordprocessingml.styles+xml", CompressionOption.Maximum);
 
             stylesDoc = HelperFunctions.DecompressXMLResource("Novacode.Resources.default_styles.xml.gz");
             XElement lang = stylesDoc.Root.Element(XName.Get("docDefaults", DocX.w.NamespaceName)).Element(XName.Get("rPrDefault", DocX.w.NamespaceName)).Element(XName.Get("rPr", DocX.w.NamespaceName)).Element(XName.Get("lang", DocX.w.NamespaceName));

DocX/Paragraph.cs

             this.startIndex = startIndex;
             this.endIndex = startIndex + GetElementTextLength(xml);
 
-            RebuildDocProperties();            
+            RebuildDocProperties();
 
             #region It's possible that a Paragraph may have pStyle references
             // Check if this Paragraph references any pStyle elements.
             {
                 Uri style_package_uri = new Uri("/word/styles.xml", UriKind.Relative);
                 PackagePart styles_document = document.package.GetPart(style_package_uri);
-                
+
                 using (TextReader tr = new StreamReader(styles_document.GetStream()))
                 {
                     XDocument style_document = XDocument.Load(tr);
                     XElement styles_element = style_document.Element(XName.Get("styles", DocX.w.NamespaceName));
 
                     var styles_element_ids = stylesElements.Select(e => e.Attribute(XName.Get("val", DocX.w.NamespaceName)).Value);
-                    
+
                     //foreach(string id in styles_element_ids)
                     //{
                     //    var style = 
                     //    styles.Add(style);
                     //} 
                 }
-            } 
+            }
             #endregion
 
             this.runs = Xml.Elements(XName.Get("r", DocX.w.NamespaceName)).ToList();

DocX/Properties/AssemblyInfo.cs

 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.1.12")]
-[assembly: AssemblyFileVersion("1.0.1.12")]
+[assembly: AssemblyVersion("1.0.1.13")]
+[assembly: AssemblyFileVersion("1.0.1.13")]