PCExpress Bandwidth Speed Test

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Bandwidth Genie

Does your Internet connection fly like an eagle or crawl like a tortoise? Is it just your imagination, or is your Internet connection slow today? Whether you are using a cable modem, an asymmetric digital subscriber line (ADSL), FIber Optic Service (FiOS), digital subscriber line (DSL), integrated services digital network (ISDN) connection, or just a plain old dial-up modem, the PCExpress Bandwidth Speed Test will give you the answer.

by "The Old Dub" - Version 2.7c

Note: Use your browser's re-load button to test again. You may need to clear the browsers cache while running this test or the result might be the effective not actual bandwidth. You can also set your browser's cache size to zero.
* ~ Indicates cache effective not actual bandwidth.



Questions & Answers:

Why do I need to clear the cahe in my browser?

How does this page calculate my connection speed?

Why do I get different speed results each time I run the Bandwidth Speed Test?

I thought my Internet connection was faster. Why does the Speed Test come up with a lower figure?

Could my Internet Service Provider (ISP) be the cause of my slow down?

I have a 56K modem. Why isn't my download speed even close to 56K?

Why do I need to clear the cahe in my browser?

The first time you load this test the results will be the actual bandwidth, as your computer's cache will not contain any of the parts of this test. After twenty seconds the test will automatically run again. Once the test has been run, your computer keeps copies of the files it has downloaded on a local storage device. Depending on your borrower’s configuration you may be loading the files from local storage rather than from the remote server. You can configure your browser to avoid this problem by setting the cache to zero. Zero cache normally forces the browser to get a fresh copy each time the script is run and thus consistently providing correct results.

How does this page calculate my connection speed?

Actually, this isn't just one Web page, it's a Web pages, with an externally loaded data file of a fixed size. When the inital page loads, it notes the time just before and just after the data file loads, then uses this information and the size of the data file to calculate the rate at which the data arrived at your computer.

Each time you click the re-load on your Browser the external file should again be loaded and the time recaculated. You may need to clear the browsers cache at least once if you've run the test before. Sometimes the cache will retain the data file and the result might be the effective not actual bandwidth.
* ~ Indicates cache effective not actual bandwidth.

Why do I get different speed results each time I run The Bandwidth Speed Test?

Like any major highway system, the Internet information highway has many roadways and interchanges, each with their own capacity and speed limit, and, like highways for cars, sometimes you get traffic delays. Just as you have to wait in a your car while other traffic goes through at a traffic light, data sent to your computer has to wait while other data passes through routers, the Internet equivalent of an intersection, on it's way to you.

You are more likely to run into slow Internet traffic during peak use hours than those times when fewer people are online, such as after 11 p.m. and before 7 a.m. When this page was being tested, I found that the results on my 144Kbps DSL line results varied from a consistent 120 to 135Kbps mid-morning and afternoon, all the way down to 64Kbps during evening peak-use hours. If you really want to find out what your best possible Bandwidth Speed Test result is, try loading this page at 3:00am on a weeknight, when almost everyone is asleep when Internet use is at it's lowest. (Friday and Saturday nights are not a good choice.)

I thought my Internet connection was supposed to be faster. Why does the Speed Test come up with a lower figure?

No Internet connection ever performs at 100%. When we test loaded this page direct from our test Web server across a two computer 10Mbps local area network (LAN), our best result was 9028.1 Kbps or 1106.4 K bytes/sec. There is always some loss, and the faster your connection is, the greater that loss is going to be.

Next, this page can only measure the time it takes the applications data--the actual data file--to reach your browser. Wrapped around that data is some overhead that can range from 2 percent to 25 percent of the total data sent. There's no way for the program built into this Web page to control or discover exactly how much overhead was used to send the page's internal data file, but generally the percentage is small, and this page adjusts its figures up by 2 percent to compensate. Nevertheless, the actual overhead may be higher than expected, resulting in a depressed value for the Kbps figure.

Also remember that your connection to your ISP is just one part of the system that gets data to your computer. Between your computer and the server that sent this Web page there are probably a dozen or more routers, communications links, and other network components this page had to travel through. Each of these components have a set capacity and speed at which they can operate, and most of them handle network traffic for thousands, even millions of computers every day. The inevitable result is that all Internet traffic encounters some sort of delay as it transits across The Net, and that reduces the amount of data that gets funneled into your connection in the first place.

I'm getting a big slowdown. Could my Internet Service Provider (ISP) be the cause of my problem?


The delay could be at your ISP, or it could be elsewhere. (See the explanation above, but if you're consistently getting Bandwidth Speed Test results that are substantially below expectations, the root problem is most likely your ISP's fault.

While your dial-up modem, DSL, ISDN or other Internet connection may be a dedicated line, all of an ISP's connections get combined into one or more shared connections. In most cases, these shared connections have less capacity than the combined total of all the customer connections they serve. Done judiciously, this works better than you probably think. Since most Internet users spend more time reading their email and Web pages than they do downloading them, they're only using a fraction of their connection's actual capacity. Overbooking allows an ISP to combine several customer connections into a single link that's smaller (and less expensive) than the combined total of all the connections they serve, without reducing the amount of data sent to a customer when they are downloading data.

The problem is that some ISPs, cable modem companies, and DSL providers take the overbooking concept too far. They funnel so many connections into a small combined connection that normal customer demand overwhelms the capacity of the combined connection. This is a particular problem during peak use hours, when line speeds can slow to a crawl.

Unfortunately, there is no remedy for this problem. As competition in the high-bandwidth Internet connection business heats up, you'll have more options and your ISP will have more incentive to maintain more reasonable overbooking ratios. Until that time, however, your only options are to complain to your ISP or switch to another Internet provider with a better track record.

I have a 56K modem. Why isn't my download speed even close to 56K?

There could be several reasons--and most of them aren't your ISP's fault.

First of all, static electricity caused by radio signals, power lines, and other sources interfere with most 56K modem signals, forcing them to fall back to 42-50Kbps.

56K modems also require a clean, straight through telephone connection to the telephone company's central office switching center. Phone company line amplifiers that boost a telephone signal over a long distance, PBX switchboard systems, and other phone equipment alter the phone signal and force 56K modems to fall back to speeds of 33.6Kbps and lower.

Finally, the FCC doesn't allow 56K modems to use the full range of signals that phone company equipment can generate. They're concerned that it'll cause static interference to other phone lines.

So no 56K modem in the United States ever connects at 56K. Most 56K modem users seem to connect at speeds of 44-48Kbps.

Raw Data:

If you're just dying to see the raw data used to calculate your download speed, here it is:

  • download start time:
  • download end time:
  • download time:
  • Test packet size in thousands of bytes:
  • estimated line speed (K bits per second):
  • estimated line speed (K bytes per second):


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