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Analyzing the use of HTTP Compression
Posted on 11/20/2005 3:48 PM by Maurice Prather
November 20, 2005 update:
 - Updated links to reference and follow-up articles.
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August 7, 2004 update:
 - The original analysis was based on compression level set to the max value (10).  Per comments and further review of the technology, level 9 offers more bang for the buck.  The analysis has been updated with results using level 9 compression. I think you will find the updated results interesting.
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Originally published: August 6, 2004
Several folks sent email asking for benchmark data on how well HTTP compression works (in reference to Weds post).
 
I've posted a document with an analysis of my system's behavior using HTTP compression.  The document can be found at here in mht format or as a zipped Word document.
 
Please keep in mind that the analysis is indicative of my hardware's capability and general rendering requirements.  If you're considering turning on HTTP compression, take the time to review your system so that you can tailor the functionality to your needs.
 
-Maurice
 
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Series articles:
Post 1/2 - Using HTTP compression with SharePoint
Post 2/2 - you're reading it!
bertK
very useful analysis! Thank you vry much for this Maurice!
Ro @ 8/6/2004 4:18 PM
re: Analyzing the use of HTTP Compression
OK you've got me curious ;) Using your steps as a guide (albeit with a little tweaking) I've re-enabled comp[ression on my server to test it. I don't think the steps I used previously were as comprehensive as yours.
 
One thing I do remembr from before, however, is that apparently the difference in compression between level 9 and 10 is not that great but the CPU usage is significantly lower when the compression level is set to 9 rather than 10.
 
Here goes nothing...
Colin Walker @ 8/7/2004 10:51 AM
re: Analyzing the use of HTTP Compression
Good point...  the analysis didn't even take into account variations in compression levels.  I'll have to run another test to see how things change between 9 and 10.  :)
 
Maurice Prather @ 8/7/2004 11:39 AM
re: Analyzing the use of HTTP Compression
Can you please post the attachment in another format (preferable plain HTML or PDF)? I am working at a large public government organization and our computers are locked down to not allow MHT files. Thank you!
Darius Kempf @ 10/22/2004 6:29 AM
re: Analyzing the use of HTTP Compression
Sure thing...  A native Word document is available at http://www.bluedoglimited.com/Shared%20Documents/HTTP%20Compression%20Analysis.zip.
 
Anonymous User @ 10/22/2004 3:04 PM
Anonymous Bastard
Thanks for the tips Maurice. I enabled compression on my Portal and took the total initial load size down by 2/3 by just compressing .js and .css files.
Bho @ 7/2/2006 9:19 AM
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