The document provides guidance on troubleshooting performance issues in Drupal, emphasizing the importance of data and user feedback to identify problems. Key areas to check include Varnish, caching, CDN availability, hosting quality, and page load times. It also mentions tools like Load Impact and New Relic for testing and understanding performance metrics.

1. TROUBLESHOOTING
Drupal Performance Problems

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Speed Matters

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When To Think About Performance
• When you actually
have a problem.
• Before a launch or
major traffic event.

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Do Not Do Optimize Prematurely

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Use Data to Do Your Performance Work

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Two Pillars of Performance Troubleshooting

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But Also Make Sure To Use Your Intuition

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How Do Know If You Have Performance Problems
• When the Data Shows
You Have a Problem
• When Your Start
Hearing Complaints
from Your Users

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Five Things To Check First
1. Is Varnish Working?
2. Is Drupal Caching?
3. Do You Have a CDN?
4. Is Your Host a Good One?
5. Is Your Page Load Sane?

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http://varnishcheck.getpantheon.com
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Is Varnish Working?

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admin/config/development/performance
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Is Drupal Caching?

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https://www.fastly.com
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Do You Have a CDN?

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https://pantheon.io
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Is Your Host a Good One?

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http://getfirebug.com
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Is Your Page Load Sane?

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Then Let’s Start Testing

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Load Impact 101

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Load Impact: Custom Scenarios
https://chrome.google.com/webstore/detail/load-impact-user-scenario

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Load Impact: Running the Test

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New Relic 101

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New Relic: Understanding Results

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New Relic: Understanding the Drupal

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New Relic: Understanding the Database

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New Relic: Understanding External Services

24. THANK YOU