gistfile1.txt

diff --git a/Response.php b/Response.php
index 9544a671..54dd215c 100644
--- a/Response.php
+++ b/Response.php
@@ -370,15 +370,29 @@ class Response
      */
     public function send()
     {
+        if (extension_loaded('newrelic')) {
+            newrelic_add_custom_tracer("Response::send/sendHeaders");
+        }
         $this->sendHeaders();
+
+        if (extension_loaded('newrelic')) {
+            newrelic_add_custom_tracer("Response::send/sendContent");
+        }
         $this->sendContent();
 
         if (\function_exists('fastcgi_finish_request')) {
+            if (extension_loaded('newrelic')) {
+                newrelic_add_custom_tracer("Response::send/fastcgi_finish_request");
+            }
             fastcgi_finish_request();
         } elseif (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true)) {
             static::closeOutputBuffers(0, true);
         }
 
+        if (extension_loaded('newrelic')) {
+            newrelic_add_custom_tracer("Response::send/end");
+        }
+
         return $this;
     }