Best Practices for Speeding Up Your Web Site - Yahoo Developer Network
Change the date range, chart type and compare DASSAULT SYSTEMES against The design-software company looks well placed to benefit from the ongoing. Dive into site tools for website design, database management, small business hosting, blogging, domain hosting, and more. Starting at $/mo*; Free domain . Yahoo! Answers is a community-driven question-and-answer (Q&A) website or a knowledge .. Missing or empty |url= (help); |access-date= requires |url= (help); ^ Adamic, L.; et al. (). "Knowledge Sharing and Yahoo Answers: Everyone.
A study found that Yahoo! Answers is suboptimal for questions requiring factual answers and that the quality decreases as the number of users increases. Answers provides, particularly the persistence of inaccuracies, the inability to correct them, and a point structure that rewards participation more readily than accuracy, all indicate that the site is oriented towards encouraging use of the site, not offering accurate answers to questions. Answers itself indicate that Yahoo!
Answers attracts a large number of trolls. The site does not have a system that filters the correct answers from the incorrect answers. Answers, once the "best answer" was chosen, there was no way to add more answers nor to improve or challenge the best answer chosen by the question asker; there is a display of thumbs down or thumbs up for each answer, but viewers cannot vote. In Aprilthis was changed to allow for additional answers after a best answer is chosen, but the best answer can never be changed.
Also, while "best answers" can be briefly commented upon, the comment is not visible by default and is hence hardly read. If the best answer chosen is wrong or contains problematic information, the only chance to give a better or correct answer will be the next time the same question is asked. The older answer will likely get higher priority in search engines. Any new answer will most probably not be seen by any original questioner.
Answers mascot is a cartoon hamster called Yamster. Trying to gzip them not only wastes CPU but can potentially increase file sizes.O NOME DO CRIADOR - FATOS CHOCANTES, PORÉM VERDADEIROS!
Gzipping as many file types as possible is an easy way to reduce page weight and accelerate the user experience. Put Stylesheets at the Top tag: This is because putting stylesheets in the HEAD allows the page to render progressively.
Front-end engineers that care about performance want a page to load progressively; that is, we want the browser to display whatever content it has as soon as possible.
This is especially important for pages with a lot of content and for users on slower Internet connections. The importance of giving users visual feedback, such as progress indicators, has been well researched and documented. In our case the HTML page is the progress indicator! When the browser loads the page progressively the header, the navigation bar, the logo at the top, etc. This improves the overall user experience. The problem with putting stylesheets near the bottom of the document is that it prohibits progressive rendering in many browsers, including Internet Explorer.
These browsers block rendering to avoid having to redraw elements of the page if their styles change. The user is stuck viewing a blank white page. Put Scripts at the Bottom tag: If you serve your images from multiple hostnames, you can get more than two downloads to occur in parallel.
While a script is downloading, however, the browser won't start any other downloads, even on different hostnames. In some situations it's not easy to move scripts to the bottom. If, for example, the script uses document. There might also be scoping issues. In many cases, there are ways to workaround these situations. An alternative suggestion that often comes up is to use deferred scripts.
In Internet Explorer, the script may be deferred, but not as much as desired. If a script can be deferred, it can also be moved to the bottom of the page. That will make your web pages load faster. Avoid CSS Expressions tag: They were supported in Internet Explorer starting with version 5, but were deprecated starting with IE8.
As an example, the background color could be set to alternate every hour using CSS expressions: The expression method is ignored by other browsers, so it is useful for setting properties in Internet Explorer needed to create a consistent experience across browsers.
The problem with expressions is that they are evaluated more frequently than most people expect. Not only are they evaluated when the page is rendered and resized, but also when the page is scrolled and even when the user moves the mouse over the page.
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Moving the mouse around the page can easily generate more than 10, evaluations. One way to reduce the number of times your CSS expression is evaluated is to use one-time expressions, where the first time the expression is evaluated it sets the style property to an explicit value, which replaces the CSS expression.
This factor, although difficult to quantify, can be gauged using various metrics. If users on your site have multiple page views per session and many of your pages re-use the same scripts and stylesheets, there is a greater potential benefit from cached external files.
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The browser can't download anything from this hostname until the DNS lookup is completed. DNS lookups are cached for better performance. This caching can occur on a special caching server, maintained by the user's ISP or local area network, but there is also caching that occurs on the individual user's computer.
Most browsers have their own caches, separate from the operating system's cache. As long as the browser keeps a DNS record in its own cache, it doesn't bother the operating system with a request for the record. Firefox caches DNS lookups for 1 minute, controlled by the network. Fasterfox changes this to 1 hour. When the client's DNS cache is empty for both the browser and the operating systemthe number of DNS lookups is equal to the number of unique hostnames in the web page. This includes the hostnames used in the page's URL, images, script files, stylesheets, Flash objects, etc.
Reducing the number of unique hostnames reduces the number of DNS lookups. Reducing the number of unique hostnames has the potential to reduce the amount of parallel downloading that takes place in the page. Avoiding DNS lookups cuts response times, but reducing parallel downloads may increase response times. My guideline is to split these components across at least two but no more than four hostnames.
This results in a good compromise between reducing DNS lookups and allowing a high degree of parallel downloads. When code is minified all comments are removed, as well as unneeded white space characters space, newline, and tab.
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.
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.
One way to avoid accidentally including the same script twice is to implement a script management module in your templating system. An "entity" is another word a "component":