How is overall elapsed time calculated

2 posts, 0 answers
  1. Thirukumaran
    Thirukumaran avatar
    1 posts
    Member since:
    Jul 2019

    Posted 03 Jul 2019 Link to this post

    If you look below the overall elapsed time given by fiddler is 1.377 seconds but when calculate the time between 11:56:17.495 & 11:56:20.382 it looks like it took 0:00:02.887 So how is the overall elapsed item calculated.

    Determine Gateway:0ms
    DNS Lookup: 0ms
    TCP/IP Connect:0ms
    HTTPS Handshake:0ms

    Overall Elapsed:0:00:01.377



  2. Eric R | Senior Technical Support Engineer
    Eric R | Senior Technical Support Engineer avatar
    388 posts

    Posted 08 Jul 2019 Link to this post

    Hi Thirukumaran,

    The Overall Elapsed time from the Statistics tab is calculated using the ​ClientDoneResponse​ value less the ​ClientBeginRequest value. Note that by default, Fiddler captures timestamps using the default system clock with a precision of 15.6 milliseconds (ms). If an operation takes less time than the 15.6ms it will appears as no time at all. This may result in slightly rounded values.

    For example, the provided ClientDoneRepsonse of 20.382 less the ClientBeginRequest of 19.004 is 1.378 which is about what the overall elapsed time is recorded. 

    To enable high-resolution timers of 1ms instead of 15.6ms, select the checkbox under Tools > Fiddler Options > General tab. This will also increase power consumption on mobile devices and laptops.

    Please let me know if you need any additional information and thank you for using the Telerik Fiddler forums.


    Eric R
    Progress Telerik
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