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PHP Profiling
We use a free version of Blackfire for profiling. You need to install a PHP ext to your machine. All what you need:
- install the browser extension for Firefox (docs) or Chrome (docs).
- Go to any page on http://localhost:8000 that you want to profile.
- Click on the extension icon and press "Profile". Wait for results 😃 Credentials to see results you can find at LastPass.
How results look like (home page): 
Materials
Great talk: Laracon US 2016 - Fabien Potencier - PHP Performance Tuning With Blackfire