Here are some quick numbers (provided by YSlow) from the home page of this webapp:
Without gzip compression on image/png,image/jpeg,image/gif: 133.1K 12 Images With gzip compression: 1.7K 12 Images ..,Actually now that I'm looking in detail at the numbers reported for each individual image by YSLow, I'm starting to think that it doesn't calculate the size of gzipped images correctly. Here were the largest size images on this page pre-compression (I've removed the filenames): jpg 43.8K jpg 39.4K jpg 31.1K gif 7.4K png 4.5K gif 2.5K gif 2.4K With compression turned on: jpg gzip 0K gif gzip 0K gif gzip 0K gif gzip 0K jpg gzip 0K jpg gzip 0K png gzip 0K Seems like my earlier findings were incorrect based on this - surely gzip is not capable of compressing images to zero byte files :) I should have looked further into the "total size" number reported by Yslow instead of taking it for granted as being correct. Thanks again for pointing this out, I'll likely go ahead and disable these types from wastefully being recompressed on the server. -Matt -----Original Message----- From: Christopher Schultz [mailto:ch...@christopherschultz.net] Sent: Friday, March 20, 2009 10:16 AM To: Tomcat Users List Subject: Re: Question on Executor and maxThreads reported by Manager -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Matt, On 3/20/2009 9:10 AM, Matt Brown wrote: > Actually yes, in our case the image content is not already > sufficiently compressed by the content provider - we're seeing a > sizeable decrease in the size of the images delivered after enabling > gzip on them. You may be able to re-code some of these graphics using higher compression (better results with PNG) or lower quality (for JPG) though lower quality will always be... lower quality. Interesting that gzip does a good job with these files. Can you give some metrics? I'd be interested to see how well it does. Is this for a mobile application? Or are you just trying to reduce bandwidth use in general? - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAknDpScACgkQ9CaO5/Lv0PDjMwCeMdwZw7SzUVH6YXjkAkzzECu8 Mg4AnRyjK+WCorIkVCFcCyFMFKhnZByW =+4e5 -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
