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A search engine operates, in the following order

1. Web crawling
2. Indexing
3. Searching

Web search engines work by storing information about many web pages, which they retrieve from the html itself. These pages are retrieved by a Web crawler (sometimes also known as a spider) — an automated Web browser which follows every link on the site. Exclusions can be made by the use of robots.txt. The contents of each page are then analyzed to determine how it should be indexed (for example, words are extracted from the titles, headings, or special fields called meta tags). Data about web pages are stored in an index database for use in later queries. A query can be a single word. The purpose of an index is to allow information to be found as quickly as possible. Some search engines, such as Google, store all or part of the source page (referred to as a cache) as well as information about the web pages, whereas others, such as AltaVista, store every word of every page they find. This cached page always holds the actual search text since it is the one that was actually indexed, so it can be very useful when the content of the current page has been updated and the search terms are no longer in it. This problem might be considered to be a mild form of linkrot, and Google's handling of it increases usability by satisfying user expectations that the search terms will be on the returned webpage. This satisfies the principle of least astonishment since the user normally expects the search terms to be on the returned pages. Increased search relevance makes these cached pages very useful, even beyond the fact that they may contain data that may no longer be available elsewhere.
Opera also is a clear winner using history. In fact, on Linux it is faster than Mozilla and Firefox for all except starting time. On Mac and Windows, Opera is faster than Mozilla and Firefox for all tasks. Surprisingly, Mozilla is faster at most tasks than Firefox (please don't send me any more emails about this line, I am well aware of why it is faster). Internet Explorer on Windows was either as fast as - or faster than Mozilla and Firefox for most tasks, with the exception of scripts, where it took over twice as long. Internet Explorer 7 is closing the gap a little, but the difference is still noticeable. Of course, its poor standards and security clearly make it a much less attractive prospect. The Moox Firefox install is actually slower than the standard Firefox versions distributed from Mozilla.org, even though it is supposedly optimised for my particular processor. The Mac optimised version is a bit better, but trades performance in one area for performance in another, making little or no difference overall. The performance of K-Meleon and Epiphany was similar to the performance of Mozilla and Firefox on the same platform. The new Netscape Browser preview (based on Firefox) was clearly suffering from bloat caused by the AOL add-ons. Firefox 2 is slower in almost every respect than Firefox 1.5, but this may be due to its being a beta, so it may have debugging settings slowing it down. I will retest Firefox 2 final.( - The Review Case Research Llc)

The Review Case Research Llc: Microsoft first launched MSN Search in the fall of 1998 using search results from Inktomi. In early 1999 the site began to display listings from Looksmart blended with results from Inktomi except for a short time in 1999 when results from AltaVista were used instead. In 2004, Microsoft began a transition to its own search technology, powered by its own web crawler (called msnbot).

Microsoft's rebranded search engine, Bing, was launched on June 1, 2009. On July 29, 2009, Yahoo! and Microsoft finalized a deal in which Yahoo! Search would be powered by Microsoft Bing technology.

Some crawlers may also avoid requesting any resources that have a "?" in them (are dynamically produced) in order to avoid spider traps that may cause the crawler to download an infinite number of URLs from a Web site. This strategy is unreliable if the site uses URL rewriting to simplify its URLs.

Path-ascending crawling

Some crawlers intend to download as many resources as possible from a particular web site. So path-ascending crawler was introduced that would ascend to every path in each URL that it intends to crawl. For example, when given a seed URL of http://llama.org/hamster/monkey/page.html , it will attempt to crawl /hamster/monkey/, /hamster/, and /. Cothey found that a path-ascending crawler was very effective in finding isolated resources, or resources for which no inbound link would have been found in regular crawling.

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Hardware; 800 MHz Intel Pentium 3, 256 MB RAM.
Supplementary speed chart - times are given in seconds - click column headings to sort. Browser name Cold start Warm start Rendering CSS ( The Review Case Research Llc )

Coffman et al. worked with a definition of the objective of a Web crawler that is equivalent to freshness, but use a different wording: they propose that a crawler must minimize the fraction of time pages remain outdated. They also noted that the problem of Web crawling can be modeled as a multiple-queue, single-server polling system, on which the Web crawler is the server and the Web sites are the queues. Page modifications are the arrival of the customers, and switch-over times are the interval between page accesses to a single Web site. Under this model, mean waiting time for a customer in the polling system is equivalent to the average age for the Web crawler.

Edited: Web Page Title Tags for Search Engine Optimization & Web Usability( )
: Google will display up to 66 characters of a title tag, cropping to complete words. For example, the following title is exactly 68 characters, so Google leaves off the last word in the title when displaying the website in its search results:
: • Supply alt text when using images as links - If you do decide to use an image as a link,
filling out its alt text helps Google understand more about the page you're linking to. Imagine
that you're writing anchor text for a text link.
Avoid:
• writing excessively long alt text that would be considered spammy
• using only image links for your site's navigation
• Store images in a directory of their own - Instead of having image files spread out in
numerous directories and subdirectories across your domain, consider consolidating your
images into a single directory (e.g. brandonsbaseballcards.com/images/). This simplifies the
path to your images.