Abstract
In this paper, we first examine the causal relationship between the perceived video download speed and user engagement, while the speed has a very limited impact on views of short-length videos, a lower speed could significantly impair the viewing completion rate of medium and long-length videos. In addition, we observe that a view with an experienced speed close to half of the video bitrate lasts 10% of the video less in comparison to a similar view with a higher relative speed. At last, We also pointed out that crossing AS (Autonomous System) borders does not necessarily imply a higher likelihood of being a problem session, as only 22% of the AS pairs show a statistically significant impact on video download speed.
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