By Steve Souders
Want your site to exhibit extra quick? This booklet provides 14 particular ideas that might reduce 25% to 50% off reaction time while clients request a web page. writer Steve Souders, in his task as leader functionality Yahoo!, accrued those top practices whereas optimizing many of the most-visited pages on the internet. Even websites that had already been hugely optimized, corresponding to Yahoo! seek and the Yahoo! entrance web page, have been capable of take advantage of those unusually easy functionality guidelines.
The principles in High functionality internet Sites clarify how one can optimize the functionality of the Ajax, CSS, JavaScript, Flash, and photographs that you've got already equipped into your website -- changes which are serious for any wealthy net software. different resources of data pay loads of recognition to tuning internet servers, databases, and undefined, however the bulk of demonstrate time is taken up at the browser aspect and by means of the conversation among server and browser. High functionality internet Sites covers each element of that process.
Each functionality rule is supported by way of particular examples, and code snippets can be found at the book's significant other website. the principles contain how to:
- Make Fewer HTTP Requests
- Use a content material supply Network
- Add an Expires Header
- Gzip Components
- Put Stylesheets on the Top
- Put Scripts on the Bottom
- Avoid CSS Expressions
- Make JavaScript and CSS External
- Reduce DNS Lookups
- Minify JavaScript
- Avoid Redirects
- Remove Duplicates Scripts
- Configure ETags
- Make Ajax Cacheable
If you are development pages for prime site visitors locations and wish to optimize the adventure of clients traveling your website, this booklet is indispensable.
"If every person might enforce simply 20% of Steve's instructions, the net will be adramatically larger position. among this e-book and Steve's YSlow extension, there is reallyno excuse for having a slow website anymore."
-Joe Hewitt, Developer of Firebug debugger and Mozilla's DOM Inspector
"Steve Souders has performed a beautiful activity of distilling a big, semi-arcane paintings right down to a suite of concise, actionable, pragmatic engineering steps that would switch the realm of internet performance."
-Eric Lawrence, Developer of the Fiddler internet Debugger, Microsoft Corporation
Read or Download High Performance Web Sites: Essential Knowledge for Front-End Engineers PDF
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Additional info for High Performance Web Sites: Essential Knowledge for Front-End Engineers
W3. org/Protocols/rfc2616/rfc2616-sec13. html#sec13. three. 4), if either one of those headers are within the request, the beginning server “MUST no longer go back a reaction prestige of 304 (Not changed) except doing so is in line with all the conditional header fields within the request. ” it can truly be larger if the If-NoneMatch header wasn’t even there. That’s the answer mentioned within the subsequent part. * See the “Apache http daemon dossier inode disclosure vulnerability” net article at http://www3. ca. com/ securityadvisor/vulninfo/vuln. aspx? ID=7196 for additional information. ninety two | bankruptcy thirteen: Rule thirteen: Configure ETags ETags: Use ’Em or Lose ’Em when you've got a number of servers web hosting your website and you’re utilizing Apache or IIS with the default ETag configuration, your clients have become slower pages, your servers have the next load, you’re eating larger bandwidth, and proxies aren’t caching your content material successfully. “But wait! ” you assert, “I Rule three and extra a much destiny Expires header to my parts. There shouldn’t be any conditional GET requests. ” no matter if your elements have a miles destiny Expires header, a conditional GET request continues to be made at any time when the person clicks Reload or Refresh. There’s no method round it— the matter with ETags should be addressed. One choice is to configure your ETags to exploit their versatile validation features. One instance could be a script that varies counting on even if the browser is net Explorer. utilizing Hypertext Preprocessor to generate the script, you may set the ETag header to mirror the browser nation: when you have elements that experience to be demonstrated in response to whatever except the last-modified date, ETags are a strong manner of doing that. in the event you don’t have the necessity to customise ETags, you must easily get rid of them. either Apache and IIS have pointed out ETags as a functionality factor, and recommend altering the contents of the Etag (see http://www. apacheweek. com/issues/02-01-18, http://support. microsoft. com/? id=922733, and http://support. microsoft. com/kb/922703 for extra details). Apache types 1. three. 23 and later aid the FileETag directive. With this directive, the inode worth may be faraway from the ETag, leaving dimension and timestamp because the closing elements of the ETag. equally, in IIS you could set the ChangeNumber to be exact throughout all servers, leaving the dossier timestamp because the in simple terms different piece of data within the ETag. Following those feedback leaves an ETag that comprises simply the scale and timestamp (Apache) or simply the timestamp (IIS). notwithstanding, simply because this is often essentially reproduction info, it’s greater to simply eliminate the ETag altogether—the Last-Modified header presents sufficiently identical details, and elimination the ETag reduces the dimensions of the HTTP headers in either the reaction and next requests. The Microsoft help articles referenced during this part describe the way to get rid of ETags. ETags: Use ’Em or Lose ’Em | ninety three In Apache, you could get rid of Etags through easily including the subsequent line for your Apache configuration dossier: FileETag none ETags within the actual global desk 13-1 indicates that 6 out of 10 most sensible U.