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Obfuscation is an alternative optimization that can be applied to source code. It's more complex than minification and thus more likely to generate bugs as a result of the obfuscation step itself.
Redirects are accomplished using the and status codes. Here's an example of the HTTP headers in a response:.
The browser automatically takes the user to the URL specified in the Location field. All the information necessary for a redirect is in the headers.
The body of the response is typically empty. Despite their names, neither a nor a response is cached in practice unless additional headers, such as Expires or Cache-Control , indicate it should be.
The main thing to remember is that redirects slow down the user experience. Inserting a redirect between the user and the HTML document delays everything in the page since nothing in the page can be rendered and no components can start being downloaded until the HTML document has arrived.
One of the most wasteful redirects happens frequently and web developers are generally not aware of it. For example, going to http: Connecting an old web site to a new one is another common use for redirects.
Others include connecting different parts of a website and directing the user based on certain conditions type of browser, type of user account, etc.
Using a redirect to connect two web sites is simple and requires little additional coding. Although using redirects in these situations reduces the complexity for developers, it degrades the user experience.
In Internet Explorer, if an external script is included twice and is not cacheable, it generates two HTTP requests during page loading.
Even if the script is cacheable, extra HTTP requests occur when the user reloads the page. In addition to generating wasteful HTTP requests, time is wasted evaluating the script multiple times.
One way to avoid accidentally including the same script twice is to implement a script management module in your templating system. In addition to preventing the same script from being inserted multiple times, this function could handle other issues with scripts, such as dependency checking and adding version numbers to script filenames to support far future Expires headers.
Entity tags ETags are a mechanism that web servers and browsers use to determine whether the component in the browser's cache matches the one on the origin server.
An "entity" is another word a "component": ETags were added to provide a mechanism for validating entities that is more flexible than the last-modified date.
An ETag is a string that uniquely identifies a specific version of a component. The only format constraints are that the string be quoted.
The origin server specifies the component's ETag using the ETag response header. Later, if the browser has to validate a component, it uses the If-None-Match header to pass the ETag back to the origin server.
If the ETags match, a status code is returned reducing the response by bytes for this example. Tue, 12 Dec ETags won't match when a browser gets the original component from one server and later tries to validate that component on a different server, a situation that is all too common on Web sites that use a cluster of servers to handle requests.
By default, both Apache and IIS embed data in the ETag that dramatically reduces the odds of the validity test succeeding on web sites with multiple servers.
The ETag format for Apache 1. Although a given file may reside in the same directory across multiple servers, and have the same file size, permissions, timestamp, etc.
The end result is ETags generated by Apache and IIS for the exact same component won't match from one server to another.
If the ETags don't match, the user doesn't receive the small, fast response that ETags were designed for; instead, they'll get a normal response along with all the data for the component.
If you host your web site on just one server, this isn't a problem. But if you have multiple servers hosting your web site, and you're using Apache or IIS with the default ETag configuration, your users are getting slower pages, your servers have a higher load, you're consuming greater bandwidth, and proxies aren't caching your content efficiently.
Even if your components have a far future Expires header, a conditional GET request is still made whenever the user hits Reload or Refresh.
If you're not taking advantage of the flexible validation model that ETags provide, it's better to just remove the ETag altogether.
The Last-Modified header validates based on the component's timestamp. This Microsoft Support article describes how to remove ETags.
In Apache, this is done by simply adding the following line to your Apache configuration file: FileETag none top discuss this rule.
One of the cited benefits of Ajax is that it provides instantaneous feedback to the user because it requests information asynchronously from the backend web server.
In many applications, whether or not the user is kept waiting depends on how Ajax is used. For example, in a web-based email client the user will be kept waiting for the results of an Ajax request to find all the email messages that match their search criteria.
It's important to remember that "asynchronous" does not imply "instantaneous". To improve performance, it's important to optimize these Ajax responses.
The most important way to improve the performance of Ajax is to make the responses cacheable, as discussed in Add an Expires or a Cache-Control Header.
Some of the other rules also apply to Ajax: Let's look at an example. If the user hasn't modified her address book since the last time she used the email web app, the previous address book response could be read from cache if that Ajax response was made cacheable with a future Expires or Cache-Control header.
The browser must be informed when to use a previously cached address book response versus requesting a new one. If the address book hasn't been modified since the last download, the timestamp will be the same and the address book will be read from the browser's cache eliminating an extra HTTP roundtrip.
If the user has modified her address book, the timestamp ensures the new URL doesn't match the cached response, and the browser will request the updated address book entries.
Even though your Ajax responses are created dynamically, and might only be applicable to a single user, they can still be cached. Doing so will make your Web 2.
When users request a page, it can take anywhere from to ms for the backend server to stitch together the HTML page. During this time, the browser is idle as it waits for the data to arrive.
In PHP you have the function flush. It allows you to send your partially ready HTML response to the browser so that the browser can start fetching components while your backend is busy with the rest of the HTML page.
Based on the HTTP specs , GET is meant for retrieving information, so it makes sense semantically to use GET when you're only requesting data, as opposed to sending data to be stored server-side.
You can take a closer look at your page and ask yourself: The rest of the content and components can wait.
Other places to look for candidates for post-loading include hidden content content that appears after a user action and images below the fold. Tools to help you out in your effort: For an example in the wild take a look at Yahoo!
Home Page with Firebug's Net Panel turned on. It's good when the performance goals are inline with other web development best practices.
So after you've made sure the page works fine, you can enhance it with some post-loaded scripts that give you more bells and whistles such as drag and drop and animations.
Preload may look like the opposite of post-load, but it actually has a different goal. By preloading components you can take advantage of the time the browser is idle and request components like images, styles and scripts you'll need in the future.
This way when the user visits the next page, you could have most of the components already in the cache and your page will load much faster for the user.
It makes a difference if you loop through or DOM elements on the page when you want to add an event handler for example. A high number of DOM elements can be a symptom that there's something that should be improved with the markup of the page without necessarily removing content.
Are you using nested tables for layout purposes? Maybe there's a better and more semantically correct way to do your markup. The number of DOM elements is easy to test, just type in Firebug's console: And how many DOM elements are too many?
Check other similar pages that have good markup. For example the Yahoo! Splitting components allows you to maximize parallel downloads.
Make sure you're using not more than domains because of the DNS lookup penalty. For example, you can host your HTML and dynamic content on www.
Iframes allow an HTML document to be inserted in the parent document. It's important to understand how iframes work so they can be used effectively.
Information about cookies is exchanged in the HTTP headers between web servers and browsers. It's important to keep the size of cookies as low as possible to minimize the impact on the user's response time.
The take-home of this research: Eliminate unnecessary cookies Keep cookie sizes as low as possible to minimize the impact on the user response time Be mindful of setting cookies at the appropriate domain level so other sub-domains are not affected Set an Expires date appropriately.
An earlier Expires date or none removes the cookie sooner, improving the user response time top. When the browser makes a request for a static image and sends cookies together with the request, the server doesn't have any use for those cookies.
So they only create network traffic for no good reason. You should make sure static components are requested with cookie-free requests.
Create a subdomain and host all your static components there. If your domain is www. However, if you've already set cookies on the top-level domain example.
In this case, you can buy a whole new domain, host your static components there, and keep this domain cookie-free. Another benefit of hosting static components on a cookie-free domain is that some proxies might refuse to cache the components that are requested with cookies.
Sometimes pages feel less responsive because of too many event handlers attached to different elements of the DOM tree which are then executed too often.
That's why using event delegation is a good approach. If you have 10 buttons inside a div , attach only one event handler to the div wrapper, instead of one handler for each button.
Events bubble up so you'll be able to catch the event and figure out which button it originated from.
You also don't need to wait for the onload event in order to start doing something with the DOM tree. Often all you need is the element you want to access to be available in the tree.
You don't have to wait for all images to be downloaded. DOMContentLoaded is the event you might consider using instead of onload, but until it's available in all browsers, you can use the YUI Event utility, which has an onAvailable method.
One of the previous best practices states that CSS should be at the top in order to allow for progressive rendering.
The problem with this filter is that it blocks rendering and freezes the browser while the image is being downloaded. It also increases memory consumption and is applied per element, not per image, so the problem is multiplied.
After a designer is done with creating the images for your web page, there are still some things you can try before you FTP those images to your web server.
Don't use a bigger image than you need just because you can set the width and height in HTML. It's a necessary evil because even if you don't care about it the browser will still request it, so it's better not to respond with a Not Found.
Also since it's on the same server, cookies are sent every time it's requested. This image also interferes with the download sequence, for example in IE when you request extra components in the onload, the favicon will be downloaded before these extra components.
Imagemagick can help you create small favicons. This restriction is related to the fact that iPhone won't cache components bigger than 25K.
Note that this is the uncompressed size. This is where minification is important because gzip alone may not be sufficient. For more information check " Performance Research, Part 5: Packing components into a multipart document is like an email with attachments, it helps you fetch several components with one HTTP request remember: HTTP requests are expensive.
When you use this technique, first check if the user agent supports it iPhone does not. Image with empty string src attribute occurs more than one will expect.
It appears in two form: Both forms cause the same effect: Internet Explorer makes a request to the directory in which the page is located.
Safari and Chrome make a request to the actual page itself. Firefox 3 and earlier versions behave the same as Safari and Chrome, but version 3.
Opera does not do anything when an empty image src is encountered. Why is this behavior bad?