Do you have a fairly good Internet connection at home or at office? Is it regular websites load pretty quickly in your browser? But what happen when you are watching video on YouTube or download files through torrent then Speed seems to go down
If you found that this change in speed pattern quite frequently, than it’s possible that your ISP may be rate limiting your traffic for certain bandwidth intensive operations.
For an example, if your average download speed is 100kB/s, YouTube video could be streaming at a speed of 40 kB/s due to rate limiting by the your ISP.
Is your ISP is limiting your download speeds?
To check run the Glasnost test in your browser to find out whether or not your ISP is following any such tactic to manipulate your download speeds for specific sites.
Glasnost test uses a Java applet platform to compare your regular download speed with the speed at which flash videos get streamed for your system. Other than videos it can also compare the speed for email attachments, normal HTTP based files transfers, and also the torrents and binary downloads from Usenet Servers.
ISP s may be limiting speeds only during peak hours, so you should consider running these tests at different times of the day.
Note: Stop all other downloads that might be running in the background for more accurate results.