Web accelerator
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A web accelerator is a proxy server that reduces web site access times. Web accelerators may use several techniques to achieve this reduction:
- They may cache recently or frequently accessed documents so they may be sent to the client with less latency or at a faster transfer rate than the remote server could.
- They may freshen objects in the cache ensuring that frequently accessed content is readily available for display.
- They may prefetch documents that are likely to be accessed in the near future.
- They may compress documents to a smaller size, for example by reducing the quality of images or by sending only what's changed since the document was last requested.
- They may filter out ads and other undesirable objects so they are not sent to the client at all.
- They may maintain persistent TCP connections between the client and the proxy server.
Web accelerators may be installed on the client (browsing) computer / mobile device or on ISP hosted servers or both. Accelerating delivery through compression requires some type of host based server to collect, compress and then deliver content to a client computer.
As of July 2006, these applications generally serve to improve dial-up, broadband and other connections that users may not be getting the best speed from. Many users can achieve a 2 to 10 times speed increase in average browsing experience, while some report a 5 to 20 times speed increases for specific web sites and pages. Many ISPs offer web accelerators as a part of their dial up and broadband services. Web accelerators are typically designed for web browsing and, sometimes, for e-mailing and can not improve speeds of streaming, gaming, P2P downloads or many other Internet applications.
Other web accelerators are targeted at the web site or web application owners. This type of web accelerator is installed in front of web servers and application servers and use a variety of the above techniques to improve performance to all users accessing the accelerated web sites or web applications.
[edit] Most Popular
Since there are so many different different PC configerations, it is impossible for any one web accelerator to be the best as an application of its purpose. It is even possible for a web accelerator to slow down and clog up a connection. Yet onspeed's web accelerator to date is the most downloaded application.[citation needed]
[edit] Comparison
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| Compression | Operating system |
Browser | Caching | Prefetching | Client | Connection | Price | |
|---|---|---|---|---|---|---|---|---|
| SiteCelerate | Text & Images | ? | Any | Yes | Yes | user/ISP | Any | Per CPU |
| ONSPEED | Text & Images & Flash & Office Docs | Windows, Mac, Mobile devices | Any | No | No | user | Dialup, Wireless, Broadband, DSL | $49.99 (US) £24.99 pa Free (for users of BT Yahoo! Dialup Internet in the UK) |
| Proxyconn Web Accelerator | Text & Images & Flash & Office Docs | Windows, Mac, Mobile devices | Any | Yes | Yes | user | Dialup, Wireless, Broadband, DSL | $47.88 Yearly or $5.95 Monthly |
| Google Web Accelerator | Yes | Windows | Explorer, Firefox | Yes | Yes | user/Google server | Broadband | Free |
| Propel | Images, Text, Email, HTTP downloads | Windows, Mac | Explorer, Firefox, Opera, Netscape | Yes | No | End User, ISP | Dial, DSL, ISDN, Satellite, wireless | $44.95 US per year. Free with many ISP subscriptions |
| Toonel | Text & Images | Windows, Linux, MacOS, Symbian, WindowsMobile | Any | No | No | user/ISP | Any | Free |
| Freewire | Images and email attachments | Windows, except NT and 95 | Internet Explorer 5.0 or higher | ? | ? | ISP | Dial-up | local rate |
