XPost: alt.comp.os.windows-11   
   From: dan@djph.net   
      
   On 2025-09-08, Daniel70 wrote:   
   > [...]   
   > Which got me thinking ..... How do "they" Speed-test Internet Links?? ..   
   > particularly How do 'they' distinguish the Up-link TIME from the   
   > Down-link TIME?? e.g. my current speeds, using Speedtest [...]   
      
   For the most part, a speedtest works by you downloading a file of known   
   size (say 100 MiB), and then sending it back.  Exact file size will vary   
   by testing provider, but essentially it's just this:   
      
   Download start = 0.00   
   Download end = [TIME]   
      
   File size / TIME = X Mbit / sec   
      
   Upload Start = 0.00   
   Upload end = [TIME]   
      
   File size / TIME = Y Mbit / Sec   
      
      
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