YouTube video speed history shows the past video speeds of YouTube videos you watched from your location (your current browser at your current IP address). It also shows aggregate video speed by other users in your city, state, country, and worldwide.
Video speed is an important part of users’ viewing experience since it determines the amount of time user need to wait before user can start watching a video. It is also an important factor in determining the quality of the video user can watch. By making the video speed history data available, youtube hope to better inform user of speed issues as they relate to user viewing experience, and give user the ability to compare their speed numbers with other users in user region. The video speed database is updated once a day.
Factors affecting Video Speed
There are many factors that affect the video speed. Some of the factors that impact the video speed are the the Internet Service Provider you are using, the distance from your computer to Google servers, the computer you are using, other devices in your network such as other computers and Internet connected appliances. etc.
The video speed depends on a variety of different factors including the Internet Service Provider you are using, the distance from your computer to Google servers, the computer you are using, other devices in your network such as other computer and Internet connected appliances. etc.
Average Video Speed
YouTube show you the daily average video speed your browser has had when connecting from the same IP address in the past, provided that you’ve watched videos on YouTube in the past 30 days from the same browser (see “You” in the bar graph).
Average Video Speed History
YouTube show you the daily average video speed history over the past month, if you’ve had at least 4 days of viewing history in the past 30 days (see “Your Current Location” in the line graph). [source]