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SharePoint 2010 developing for performance article series:
In this series of articles I will briefly introduce you to some key concepts when it comes to developing for performance in our SharePoint 2010 applications.
Related articles in series
- SP 2010: Developing for performance Part 1 - Developer Dashboard
- SP 2010: Developing for performance Part 2 - SPMonitoredScope
- SP 2010: Developing for performance Part 3 - Caching in SharePoint 2010
- SP 2010: Developing for performance Part 4 - Logging
- SP 2010: Developing for performance Part 5 - Disposal patterns and tools
- SP 2010: Developing for performance Part 6 - CSS Sprites
- SP 2010: Developing for performance part 7 - Crunching those scripts
- SP 2010: Developing for performance Part 8 - Control that ViewState
This is part 7.
This article is a bit shorter than the others and will only cover the concept of crunching your script files in your projects. The reasoning behind a crunched file is to save on transfer-bytes between the client and server.
The reasoning behind crunching the script files are much that you can save on the client/server transfer and therefore also minimize the HTTP requests – which in turn is one step in the right direction for minimizing the page load time and render time.
Short in short; Do consider the technique if you’ve got large scripts that are taking a bit too long to load.
SharePoint 2010 are using crunched scripts
When you look at those two files in an editor, you’ll quickly see the difference between them:
SP.debug.js – 561 KB – The same file, but without the crunch
How to: Crunch your script files
There’s tons of tools on the market for crunching your scripts. Here’s a few online tools for crunching those scripts:
What is the difference when using crunched scripts?
As a quick summary I did a test with an application that are loading a somewhat large script file – first without any crunching and then the same application loading the files after they’ve been minimized with a crunch. These are the results in my SharePoint 2010 application.
- Without crunching: 445,871 bytes (435 KB)
- With crunching: 331,798 bytes (324 KB)
The net result is that we save about 25.5% in the example. If you have more dependencies and scripts, the amount of bytes you save increase.
A brief summary of the result is that if you’re crunching your script files, you’ll get a slightly smaller footprint when loading the page and making the HTTP requests. The reason for bringing this to your attention is of course that it’s a technique that’s been around for quite some time, but people tend to miss out on it because they’ve not seen the results of it. So, here you go – a visual chart telling you how it differs to use the exact same script, with and without crunching.