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ASP.NET Site Performance Secrets

ASP.NET Site Performance Secrets

By : Mattijs Perdeck
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ASP.NET Site Performance Secrets

ASP.NET Site Performance Secrets

5 (6)
By: Mattijs Perdeck

Overview of this book

Do you think that only experts with a deep understanding of the inner workings of ASP.NET, SQL Server, and IIS can improve a website's performance? Think again – because this book tosses that notion out of the window. It will help you resolve every web developer's nightmare – a slow website – with angry managers looking over your shoulder, raging calls from advertisers and clients – the lot. You don't have the time or energy to gain a thorough and complete understanding of ASP.NET performance optimization – You just need your site to run faster! This book will show you how.This hands-on book shows how to dramatically improve the performance of your ASP.NET-based website straight away, without forcing you through a lot of theoretical learning. It teaches you practical, step-by-step techniques that you can use right away to make your site faster with just the right amount of theory you need to make sense of it all.Start reading today and you could have a faster website tomorrow.Unlike other performance-related books, here you'll first learn how to pinpoint the bottlenecks that hold back your site's performance, so you can initially focus your time and energy on those areas of your site where you can quickly make the biggest difference. It then shows you how to fix the bottlenecks you found with lots of working code samples and practical advice, and just the right amount of theoretical detail.The first chapter details techniques for diagnosing performance issues using Waterfall charts. Subsequent chapters then each focus on one individual aspect of your website, providing you with numerous real-life scenarios and performance-enhancing techniques for each of them. In the last chapter, you learn how to effectively load-test your environment in order to measure the change in performance of your site without having to update your production environment – whether it is a new release or simply a small change in the database.
Table of Contents (19 chapters)
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ASP.NET Site Performance Secrets
Credits
About the Author
About the Reviewers
Preface

High-level diagnosis with Waterfall charts

Because our goal is to make a given web page load quicker, let's enumerate the components that make up a web page:

  • The file with the HTML: In the ASP.NET world, this file normally has the extension .aspx. Because of this, in the remainder of this book, I'll refer to this file as the main .aspx file. Without this file, there is no page. Generating this file most often takes most of the server resources required to generate the overall page.
  • Images and flash files: These files are often large and numerous.
  • JavaScript and CSS files: These files can block rendering of the page.

Based on this, we can categorize bottlenecks that slow down the page-loading into these broad categories:

  • Main .aspx file takes too long to generate
  • Main .aspx file takes too long to transfer from server to browser
  • Images (and flash files) take too long to transfer
  • JavaScript and CSS files block page rendering

In order to speed up loading of a page, we need to know in which of these categories the bottleneck falls. This is the focus of the remainder of this chapter. Once you know the broad category, you can further pinpoint the bottleneck and fix it. You'll see how in the subsequent chapters.

How do I figure out in which broad category the bottleneck falls? A simple way to do that is with a Waterfall chart.

A Waterfall chart shows the components that make up the page, in which order they get loaded by the browser, and more importantly, how much time they take to load. It looks similar to the following:

High-level diagnosis with Waterfall charts

If for example, the main .aspx file takes too long to load, the Waterfall chart will show a very long bar for that file.

In a little while, we'll see how to figure out the broad category of the bottleneck in a Waterfall chart. But first, let's see how to produce such a chart.

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