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truongh_36312's avatar
truongh_36312
Icon for Nimbostratus rankNimbostratus
Nov 09, 2017

How to troubleshoot website slow.

Hi, i'm troubleshooting a website are very slow on browser. - Do you have someway we can verify the slow come from client to F5 or from F5 back end to servers?

 

I tried to use curl -v https://abc.com but connection refused. - How can verify the root cause from F5 or from other end.

 

Thanks in advance.

 

BIG-IP
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  • Hannes_Rapp's avatar
    Hannes_Rapp
    Icon for Nimbostratus rankNimbostratus
    Nov 10, 2017

    I'd use Chrome browser's built in Dev Tools to start off. cURL is not suitable for this because you cannot conveniently investigate individual file response times and have a good overview at your disposal.

    Ctrl + Shift + i
    to open, and navigate to Network tab. Then visit the web site reported slow and see how long it takes for the entire page to load. Then repeat and visit the web site bypassing F5 - for that you type in end-server's internal IP address or DNS name. See if there's any considerable difference between the two (value of 
    Finish
    time). Also note if any individual files make up 50% or more of entire load time. This should be noted and discussed further with application specialists. Usually slowness issues can be solved or alleviated with the use of compression and caching features. Both can be applied in BigIP LTM.

    If there are no signs of slowness in your tests, there are some client-specific issues that could play a role. Things like customers geographic location, or presence of 2G or 3G mobile internet.