Improved document performance output and show slowest files in the summary

Author: sharwell

StyleCop.Analyzers/StyleCopTester/Program.cs

@@ -139,8 +139,9 @@ private static async Task MainAsync(string[] args, CancellationToken cancellatio
 
                         foreach (var documentId in project.DocumentIds)
                         {
+                            var document = project.GetDocument(documentId);
                             var currentDocumentPerformance = await TestDocumentPerformanceAsync(analyzers, project, documentId, force, cancellationToken).ConfigureAwait(false);
-                            Console.WriteLine($"{documentId}: {currentDocumentPerformance.EditsPerSecond:0.00}");
+                            Console.WriteLine($"{document.FilePath ?? document.Name}: {currentDocumentPerformance.EditsPerSecond:0.00}");
                             documentPerformance.Add(documentId, currentDocumentPerformance);
                         }
 
@@ -156,6 +157,18 @@ private static async Task MainAsync(string[] args, CancellationToken cancellatio
                         }
                     }
 
+                    var slowestFiles = documentPerformance.OrderBy(pair => pair.Value.EditsPerSecond).GroupBy(pair => pair.Key.ProjectId);
+                    Console.WriteLine("Slowest files in each project:");
+                    foreach (var projectGroup in slowestFiles)
+                    {
+                        Console.WriteLine($"  {solution.GetProject(projectGroup.Key).Name}");
+                        foreach (var pair in projectGroup.Take(5))
+                        {
+                            var document = solution.GetDocument(pair.Key);
+                            Console.WriteLine($"    {document.FilePath ?? document.Name}: {pair.Value.EditsPerSecond:0.00}");
+                        }
+                    }
+
                     foreach (var projectId in solution.ProjectIds)
                     {
                         double averageEditsInProject;