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I'm trying to understand why some pages of our application takes so long to load.

It's a .NET Core MVC Web App. It's working fine and fast locally but once it's deployed on Azure some pages randomly takes very long to load.

Using Application Insights profiler I can see in the transaction details that all the dependencies are loaded in a few milliseconds and then nothing happens during more than 30 seconds before the transaction resolves.

End-to-end transaction details screenshot

Is there any diagnostic tool (or do I miss a pane somewhere) to identify why there's this long inactivity period holding the request?

jiseli
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  • Could you please share the code base , will take a look. – Mohit Verma Aug 14 '19 at 07:55
  • @MohitVerma-MSFT What do you mean by "code base"? The controller action code? – jiseli Aug 14 '19 at 13:00
  • Can you [enable profiler for AppService](https://learn.microsoft.com/en-us/azure/azure-monitor/app/profiler?toc=/azure/azure-monitor/toc.json) ? This will profile requests and help to find bottlenecks. See [10 minutes episode](https://www.youtube.com/watch?v=lzqNIvHryE0) on usage of profiler with App Service – Michael Aug 14 '19 at 13:19

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