diff --git a/src/compiler/transform.ts b/src/compiler/transform.ts
index f49b3eafa17..568cf1d839e 100644
--- a/src/compiler/transform.ts
+++ b/src/compiler/transform.ts
@@ -2,6 +2,9 @@
 /// <reference path="transform.generated.ts" />
 /* @internal */
 namespace ts.transform {
+    
+    /* @internal */ export let aggregateTime = 0;
+    
     // Flags enum to track count of temp variables and a few dedicated names
     const enum TempFlags {
         Auto      = 0x00000000,  // No preferred name
@@ -40,6 +43,8 @@ namespace ts.transform {
     function aggregateTransformFlagsForNode(node: Node) {
         forEachChild(node, aggregateTransformFlagsForChildNode);
 
+        let start = new Date().getTime();
+        
         if (node.flags & NodeFlags.Ambient) {
             transformFlags |= TransformFlags.ThisNodeIsTypeScript;
         }
@@ -281,9 +286,34 @@ namespace ts.transform {
             case SyntaxKind.ExportDeclaration:
                 transformFlags |= TransformFlags.ThisNodeIsES6;
                 break;
+
+            case SyntaxKind.AnyKeyword:
+            case SyntaxKind.NumberKeyword:
+            case SyntaxKind.StringKeyword:
+            case SyntaxKind.BooleanKeyword:
+            case SyntaxKind.SymbolKeyword:
+            case SyntaxKind.TypeParameter:
+            case SyntaxKind.CallSignature:
+            case SyntaxKind.ConstructSignature:
+            case SyntaxKind.IndexSignature:
+            case SyntaxKind.MethodSignature:
+            case SyntaxKind.PropertySignature:
+                transformFlags |= TransformFlags.ThisNodeIsTypeScript;
+                node.excludeTransformFlags = TransformFlags.TypeExcludes;
+                break;
+                                
+            default:
+                if (SyntaxKind.FirstTypeNode <= node.kind && node.kind <= SyntaxKind.LastTypeNode) {
+                    transformFlags |= TransformFlags.ThisNodeIsTypeScript;
+                    node.excludeTransformFlags = TransformFlags.TypeExcludes;
+                }
+                break;
+                
         }
 
         node.transformFlags = transformFlags;
+        
+        aggregateTime += new Date().getTime() - start;
     }
 
     export class VisitorContext {
diff --git a/src/compiler/transforms/chain.ts b/src/compiler/transforms/chain.ts
index b398211f985..bc28e53d726 100644
--- a/src/compiler/transforms/chain.ts
+++ b/src/compiler/transforms/chain.ts
@@ -4,6 +4,9 @@
 /// <reference path="es5.ts" />
 /*@internal*/
 namespace ts.transform {
+    
+    export let transformTime = 0;
+    
     export type TransformationChain = (context: VisitorContext, statements: NodeArray<Statement>) => NodeArray<Statement>;
     
     export function getTransformationChain(options: CompilerOptions): TransformationChain {
@@ -25,6 +28,7 @@ namespace ts.transform {
     }
     
     function runTransformation(chain: TransformationChain, context: VisitorContext, statements: NodeArray<Statement>) {
+        let start = new Date().getTime();
         context.pushLexicalEnvironment();
         
         let transformed = chain(context, statements);
@@ -34,6 +38,7 @@ namespace ts.transform {
         }
         
         context.popLexicalEnvironment();
+        transformTime += new Date().getTime() - start;
         return transformed;
     }
     
diff --git a/src/compiler/tsc.ts b/src/compiler/tsc.ts
index 8fc69d70e38..9ec1b187c67 100644
--- a/src/compiler/tsc.ts
+++ b/src/compiler/tsc.ts
@@ -118,7 +118,7 @@ namespace ts {
     }
 
     function reportStatisticalValue(name: string, value: string) {
-        sys.write(padRight(name + ":", 12) + padLeft(value.toString(), 10) + sys.newLine);
+        sys.write(padRight(name + ":", 20) + padLeft(value.toString(), 10) + sys.newLine);
     }
 
     function reportCountStatistic(name: string, count: number) {
@@ -316,6 +316,8 @@ namespace ts {
         bindTime = 0;
         checkTime = 0;
         emitTime = 0;
+        transform.aggregateTime = 0;
+        transform.transformTime = 0;
 
         let program = createProgram(fileNames, compilerOptions, compilerHost);
         let exitStatus = compileProgram();
@@ -348,6 +350,8 @@ namespace ts {
             reportTimeStatistic("Parse time", programTime);
             reportTimeStatistic("Bind time", bindTime);
             reportTimeStatistic("Check time", checkTime);
+            reportTimeStatistic("Pre-transform time", transform.aggregateTime);
+            reportTimeStatistic("Transform time", transform.transformTime);
             reportTimeStatistic("Emit time", emitTime);
             reportTimeStatistic("Total time", programTime + bindTime + checkTime + emitTime);
         }
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 35dc62f0849..8bcb8f9e2e3 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -623,6 +623,9 @@ namespace ts {
             ContainsES6VariableBindingPattern |
             ContainsES6ParameterBindingPattern,
             
+        TypeExcludes =
+            ~ContainsTypeScript,
+            
         CallOrArrayLiteralExcludes =
             ContainsES6SpreadElement,
     }