Because of the way internet communication (TCP/IP protocol) works, a small portion of your bandwidth is used by packet headers, therefore actual speed test results will be 5-10% less than your actual package speed.
For an accurate speed test result, follow these steps:
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Plug in with a LAN cable
Connect your device (laptop / desktop) directly to your internet router using a LAN (also known as ethernet) cable. This is to negate any WiFi interference there may be between your internal WiFi, other devices or that of your neighbours.
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Close anything using the connection
Be sure to close any extra applications that may be using your internet connection, including GDrive, Dropbox, Youtube, Spotify, Netflix, etc.
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Free up your CPU
Close any unused applications as the Speedtest web based application requires full access to your CPU.
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Disconnect your other devices
Disconnect all your other devices from the internet. These devices include but are not limited to smartphones, tablets, smart TVs, media players, desktops, laptops, etc. as only unused available bandwidth can be tested.
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Open a speed test site
Visit speedtest.mybroadband.co.za or speedtest.net to test your connection.
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Run the test
Click on START to start the test and wait for it to finish.
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Rate your service
Be sure to give WIRUlink a 5-star rating after running your test.