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Because browsers typically download files and store them on disk the upper limit of this speed test is going to be limited by the fastest write speed of your PC disk drive.In the case of a spinning disk this might be as low as 500 megabit.In speed test preferences you can set a maximum memory use, for example 10, for 10 megabytes.

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Most sites you use online will have a higher ping time.

Unless you have 500 megabit to 1gigabit , you should be able to ignore ping time and still test your line to maximum speed. This is a browser based speed test, and needs some temporary memory to store the incoming data before it can free it.

Generally the higher your upload speed, the smoother the measurements. Some devices and browsers are better or worse than others at displaying a smooth upload speed.

Buffer Bloat can also make for a bumpy upload speed.

You never know, you may find that although a Flash-based test runs quickly, you actually have speed problems with your browser that should be addressed.

By the end of the upload phase, however, the overall number will be less than or equal to your upload speed except in the rare situation that you have a local upload proxy capable of buffering the whole upload amount.

If the objective is to test the quality of your internet connection then you should disable any proxy servers.

In rare cases your ISP may impose a proxy server of some kind that you cannot disable.

Since the test does use some graphics, those may also be a source of excessive CPU usage in cases where the browser is not well suited to the OS..

Check whether the drivers for your computer are the latest. If your ISP is offering a near 100megabit download speed and your desktop ethernet card is 100mbit, you may find the ethernet driver is not capable enough to handle the load.

If you are interested in ping time to all different locations, the speed test has a latency radar plot. Although it tries not to exceed the limitations of your mobile device, it might.

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