diff --git a/HISTORY.md b/HISTORY.md
index 741989e..746e4a8 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -6,6 +6,7 @@ unreleased
     - deps: setprototypeof@1.1.0
     - deps: statuses@'>= 1.3.1 < 2'
   * deps: statuses@~1.5.0
+  * perf: remove redundant `path.normalize` call
 
 0.16.2 / 2018-02-07
 ===================
diff --git a/index.js b/index.js
index f297c4c..9ee0e70 100644
--- a/index.js
+++ b/index.js
@@ -546,7 +546,6 @@ SendStream.prototype.pipe = function pipe (res) {
 
     // join / normalize from optional root dir
     path = normalize(join(root, path))
-    root = normalize(root + sep)
   } else {
     // ".." is malicious without "root"
     if (UP_PATH_REGEXP.test(path)) {
@@ -795,6 +794,15 @@ SendStream.prototype.stream = function stream (path, options) {
 
   // pipe
   var stream = fs.createReadStream(path, options)
+  
+  // apply additional transformation streams if any
+  if (options.transformStreams) {
+    for(var i = 0; i < options.transformStreams.length; i++) {
+        var transform = options.transformStreams[i];
+        stream = stream.pipe(transform);
+    }
+  }
+  
   this.emit('stream', stream)
   stream.pipe(res)