Cache

Overview

A Web cache stores copies of data locally on a browser in an effort to speed up execution of instructions, data requests and data updating of information. This temporary storage (caching) of documents – such as HTML pages and images – helps reduce bandwidth usage, server load times and usage speeds.

Because data is stored and served from the smaller cache and not from the more cumbersome original storage location, requests and overall system performance is improved.


HTTP Caching

Because most Web pages include resources that change infrequently – such as CSS files, image files, JavaScript files – they often can take up a lot of time to download over any network. In turn, this increasing amount of data slows Web page load time. Leveraging HTTP caching allows these resources to be saved by a browser, or proxy, that can refer to the locally cached copy instead of having to download it again on subsequent visits to the Web page.


Benefits

  • Reduces round-trip time by eliminating numerous HTTP requests for the required resources.
  • Reduces total payload size of the responses.
  • Reduces the bandwidth and hosting costs for your site.

Goolge cache

Google takes a snapshot of each page it examines and caches (stores) that version as a back-up. The cached version is what Google uses to judge if a page is a good match for each query. Almost all search result includes a cached link. Clicking on that link takes you to the Google cached version of that Web page instead of the current version of the page.

This is useful if the original page is unavailable because of:

  • Internet congestion.
  • A down, overloaded, or slow website.
  • The owner’s recently removing the page from the Web.
  • Sometimes you can access the cached version from a site that otherwise requires registration or a subscription.

  • Cache Resources

    Wikipedia
    SEO Site Checkup

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