Merge pull request reactjs#1187 from bvaughn/optimizing-performance

Added links to the Profiler deep-dive YouTube video

Author: bvaughn

content/blog/2018-09-10-introducing-the-react-profiler.md

@@ -18,6 +18,7 @@ This blog post covers the following topics:
 * [Troubleshooting](#troubleshooting)
   * [No profiling data has been recorded for the selected root](#no-profiling-data-has-been-recorded-for-the-selected-root)
   * [No timing data to display for the selected commit](#no-timing-data-to-display-for-the-selected-commit)
+* [Deep dive video](#deep-dive-video)
 
 ## Profiling an application
 
@@ -186,3 +187,11 @@ Sometimes a commit may be so fast that `performance.now()` doesn't give DevTools
 In this case, the following message will be shown:
 
 ![No timing data to display for the selected commit](../images/blog/introducing-the-react-profiler/no-timing-data-for-commit.png)
+
+## Deep dive video
+
+The following video demonstrates how the React profiler can be used to detect and improve performance bottlenecks in an actual React application.
+
+<br>
+
+<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/nySib7ipZdk?rel=0" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

content/docs/optimizing-performance.md

@@ -183,6 +183,23 @@ Note that **the numbers are relative so components will render faster in product
 
 Currently Chrome, Edge, and IE are the only browsers supporting this feature, but we use the standard [User Timing API](https://developer.mozilla.org/en-US/docs/Web/API/User_Timing_API) so we expect more browsers to add support for it.
 
+## Profiling Components with the DevTools Profiler
+
+`react-dom` 16.5+ and `react-native` 0.57+ provide enhanced profiling capabilities in DEV mode with the React DevTools Profiler.
+An overview of the Profiler can be found in the blog post ["Introducing the React Profiler"](/blog/2018/09/10/introducing-the-react-profiler.html).
+A video walk through of the profiler is also [available on YouTube](https://www.youtube.com/watch?v=nySib7ipZdk).
+
+If you haven't yet installed the React DevTools, you can find them here:
+
+- [Chrome Browser Extension](https://chrome.google.com/webstore/detail/react-developer-tools/fmkadmapgofadopljbjfkapdkoienihi?hl=en)
+- [Firefox Browser Extension](https://addons.mozilla.org/en-GB/firefox/addon/react-devtools/)
+- [Standalone Node Package](https://www.npmjs.com/package/react-devtools)
+
+> Note
+>
+> A production profiling bundle of `react-dom` is also available as `react-dom/profiling`.
+> Read more about how to use this bundle at [fb.me/react-profiling](https://fb.me/react-profiling)
+
 ## Virtualize Long Lists
 
 If your application renders long lists of data (hundreds or thousands of rows), we recommended using a technique known as "windowing". This technique only renders a small subset of your rows at any given time, and can dramatically reduce the time it takes to re-render the components as well as the number of DOM nodes created.