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The spike at the start can sometimes be caused by the Internet Security (virus checker) or the browser itself. For example, many Internet Security products start analysing the data of each connection before passing the data stream to the browser. In the split second this happens, the data coming in is queued. Once the Internet security product is satisfied this is not a threat, it passes this chunk along with any queued data to the browser. To the speed test, this burst of data appears as the spike at the start of the graph. I often see this happen with the Firefox web browser, which also seems to hold up the data stream near the start of the test. For example, occasionally when I start a speed test, Firefox stutters and then seems to skip ahead 10% where the speed test script sees this chunk as a speed spike. The following shows an example of the spike where I did a test on Firefox for Android, in this case over the Meteor LTE (4G) network.