Many ISPs, in an effort to wring every MegaByte / second of performance from their network, so they can make their customers happy, provide what they call "Download Accelerator" service.
Download Accelerators use several strategies, depending upon the ISP.
- Some compress the content, and require you to install an extra network component on your computer, so your computer can expand the content for viewing.
- Others strip detail from pictures (making a 300K picture into a 30K picture, for instance).
- And still others cache contents of popular web sites in a special cache on your computer, and on servers in their server farm.
Each of these strategies will have varying effect in your browsing experience. If a download accelerator is an optional feature to your service, you may do well to decide whether your access will be improved.
As of 2010/01/15, we are investigating a possible connection between use of download accelerator add-ons / services with the mysterious "Error 400 Bad Request" symptom.