Using gzip to speed up performance

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  • 1. Let’s Speed up the WEB
  • 2. Ways to Speed up the Web Data Compression gZip Reduce the number of HTTP transfers CSS Sprites Data URI Minify References –Google developer forum(These are only some of them)
  • 3. Server without gZip Configuration • Browser: – Connects to server and requests page. • Server: – No gZip support. Ignores gZip request. Sends uncompressed page. • Browser: – Receive page. – Display page.
  • 4. Server with gzip Browser: Connects to server. Notifies server that browser supports gzip "Accept-Encoding: gzip". Server: Acknowledges gzip support. Sends gzip encoded page with header "Content-Encoding: gzip". Browser: Receive page. Decode gzip encoded page based on header "Content-Encoding: gzip". Display page.
  • 5. How gzip compression works <h1>One</h1> <h2>Two</h2> <h3>Three</h3> <h4>Four</h4> <h5>Five</h5> <div>One</div> <div>Two</div> <div>Three</div> <div>Four</div> <div>Five</div> Nevertheless, there are optimizations that can be made using this method, and it'll be up to you, the developer, to decide where those are appropriate.
  • 6. How to Configure gZip in Xampp tomcat edit file /conf/server.xml and add to the HTTP Connector configuration <Connector port="8080" maxHttpHeaderSize="8192" maxThreads="150" minSpareThreads="25" maxSpareThreads="75" enableLookups="false" redirectPort="8443" acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" compression="on" compressionMinSize="2048" noCompressionUserAgents="gozilla, traviata" compressableMimeType="text/html,text/xml"/>
  • 7. Dell Mobile Statistics – gZip(Chrome) Without gZip • 28 web requests • 885 kb of data transfer • 1.5 sec With gZip • 28 web requests • 310 kb of data transfer • 774 ms Reduction of 575kb of data transfer and saved 726ms
  • 8. Time spent in loading popular websites Time Retrieving HTML Time Elsewhere Yahoo! 10% 90% Google 25% 75% MySpace 9% 91% MSN 5% 95% ebay 5% 95% Amazon 38% 62% YouTube 9% 91% CNN 15% 85% Time spent loading popular web sites 5% and 38% of the time downloading the HTML document. The other 62% to 95% of the time is spent making HTTP requests to fetch all the components in that HTML document (i.e. images, scripts, and stylesheets).
  • 9. Reduce the number of requests and the amount of data transferred • Images – CSS Image Sprites – Data URI • Js – minify • Css – minify
  • 10. CSS sprites • The name might be a little misleading, because sprites aren't little images like we might be picturing, a sprite is actually one big image. • The origin of the term "sprites" comes from old school computer graphics and the video game industry. • The idea was that the computer could fetch a graphic into memory, and then only display parts of that image at a time, which was faster than having to continually fetch new images. • CSS Sprites is pretty much the exact same theory: get the image once, shift it around and only display parts of it, saves the overhead of having to fetch multiple images.
  • 11. Example :Before making a sprite #nav li a {background:none no-repeat left center} #nav li a.item1 {background-image:url('../img/image1.gif')} #nav li a:hover.item1 {background-image:url('../img/image1_over.gif')} #nav li a.item2 {background-image:url('../img/image2.gif')} #nav li a:hover.item2 {background-image:url('../img/image2_over.gif'
  • 12. Example after making sprite #nav li a {background-image:url('../img/image_nav.gif')} #nav li a.item1 {background-position:0px 0px} #nav li a:hover.item1 {background-position:0px -72px} #nav li a.item2 {background-position:0px -143px;} #nav li a:hover.item2 {background-position:0px -215px;} ...
  • 13. Google-CSS Sprite •
  • 14. Example Data URI • <img src="slide- img4.jpg/> • data:image/jpeg;base 64,/9j/4SrCRX….. • <img src=" data:image/jpeg;base 64,/9j/4SrCRX "/> Image data URI without gZip 160ms 16ms with gzip 146ms 13ms
  • 15. Lance mobile – Statistics • Audit • Page Analyzer • Sprite Me
  • 16. Thank you