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why there is a difference between load runner response time and browser response time?

Hi All,

we are currently doing a POC for an application, where the load runner controller response time is lesser than the browser response time. 

when we verify the application transaction components time in browser developer tool ( F12 -> Network -> Timing ).

TTFB (time to first byte) takes 3.94 sec ( out of total time taken for the transaction 3.95 sec).

But same transaction takes only around 1.5 sec to complete in load runner/ PC . we have also verified that the responses of both browser and load runner are same.

we want to understand why there is a huge difference in the response time between the browser and load runner.

 

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4 Replies
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Outstanding Contributor.. Outstanding Contributor..
Outstanding Contributor..

Re: why there is a difference between load runner response time and browser response time?

Hi,

 

Please refer this KM about the difference between transaction timings in LoadRunner and doing it manually in browser:

https://softwaresupport.hpe.com/group/softwaresupport/search-result/-/facetsearch/document/KM304898

Hope it helps.

Regards,

Chau Nguyen | SW Technical Support Consultant.
LoadRunner and Performance Center


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Acclaimed Contributor.
Acclaimed Contributor.

Re: why there is a difference between load runner response time and browser response time?

Hi,

Which protocol do you use?

Regards,

Shlomi

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Absent Member.. Absent Member..
Absent Member..

Re: why there is a difference between load runner response time and browser response time?

Hi,

we are using web http/html.

Thanks,

John.

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Absent Member..

Re: why there is a difference between load runner response time and browser response time?

Hi,

As per the KM, the load runner time could be lesser than browser time ,only if client side keeps processing after the server response is completely recieved.

But in our scenario f12 developer tool displays '200 ok'  only after the page stops rendering, which means the page rendering tiem and server is almost equal.

The attached picture shows the time taken by different processes for a particular request.

 In this TTFB has consumed most of the time ( i.e. 4.05 sec ) and the content download is only 1.60 ms, which I believe is server processing time and client processing time respectively.

 When we run the same script in controller, the server response time is much lesser than (around 1.7 sec )the time shown in the attached picture.

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