dipikachadha / frontend-nanodegree-mobile-portfolio

Website Performance Optimization portfolio project

Improvements Implemented:

Index.html

1. Compressed and resized pizzeria.jpg.
2. Compressed profile picture.
3. Compressed cam_be_like.jpg.
4. Compressed 2048.png
5. Inlined css.
6. Removed request for google fonts and included the the required fonts in html.
7. Minify index.html.

views/js/main.js

1. Refactored updatePositions function which involved removing a bunch of unnecessary calculations and simplifying the for-loop.
2. Refactored changePizzaSizes function again removing unnecessary calculations and removed forced asynchronous layout.
3. Minified main.js
4. For randomPizzas querySelectorAll is replaced getElementsByClassName.
5. Declared the pizzasDiv variable outside the loop, so only DOM call is made one.
6. Declared the phase variable (var phase;) in the initialisation of the for loop so as to prevent it from being created every time the loop is executed.
7. Reduced the no.of background pizzas to 24.

views/css/style.css

1. minified css.
2. minified bootstrap-grid.css.
3. Added transform: translateZ() to randomPizzaContainer.
4. Added backface-visibility: hidden; property to randomPizzaContainer.

pizza.html

1. Minified pizza.html
2. Compressed pizzeria.jpg

Your challenge, if you wish to accept it (and we sure hope you will), is to optimize this online portfolio for speed! In particular, optimize the critical rendering path and make this page render as quickly as possible by applying the techniques you've picked up in the Critical Rendering Path course.

To get started, check out the repository and inspect the code.

Getting started

Part 1: Optimize PageSpeed Insights score for index.html

Some useful tips to help you get started:

1. Check out the repository
2. To inspect the site on your phone, you can run a local server

$> cd /path/to/your-project-folder
$> python -m SimpleHTTPServer 8080

1. Open a browser and visit localhost:8080
2. Download and install ngrok to the top-level of your project directory to make your local server accessible remotely.

$> cd /path/to/your-project-folder
$> ./ngrok http 8080

1. Copy the public URL ngrok gives you and try running it through PageSpeed Insights! Optional: More on integrating ngrok, Grunt and PageSpeed.

Profile, optimize, measure... and then lather, rinse, and repeat. Good luck!

Part 2: Optimize Frames per Second in pizza.html

To optimize views/pizza.html, you will need to modify views/js/main.js until your frames per second rate is 60 fps or higher. You will find instructive comments in main.js.

You might find the FPS Counter/HUD Display useful in Chrome developer tools described here: Chrome Dev Tools tips-and-tricks.

Optimization Tips and Tricks

• Optimizing Performance
• Analyzing the Critical Rendering Path
• Optimizing the Critical Rendering Path
• Avoiding Rendering Blocking CSS
• Optimizing JavaScript
• Measuring with Navigation Timing. We didn't cover the Navigation Timing API in the first two lessons but it's an incredibly useful tool for automated page profiling. I highly recommend reading.
• The fewer the downloads, the better
• Reduce the size of text
• Optimize images
• HTTP caching

Customization with Bootstrap

The portfolio was built on Twitter's Bootstrap framework. All custom styles are in dist/css/portfolio.css in the portfolio repo.

• Bootstrap's CSS Classes
• Bootstrap's Components