How to identify why my .net Web App is occasionally slow due to high CPU time

Question

I have a Web App running an .NET application. A few times a week, the response times increase significantly from the norm and I can see high CPU usage.

I have Application Insights enabled along with application logging.

What's the best approach for identifying the root cause of the sudden increase in CPU and response times?

Answer 1

Hi MeganB,

you already enabled application insight for application logging you can also identify the root cause

you can analysis performance trend in application insights with following key metrics like average response time, CPU usage and failed requests

check the application insights for long running query, slow http requests also cause for high CPU usage

you can also enable application insight profiler for deeper analysis it helps to capture periodic snapshots of code execution during high CPU periods.

Use Live Metrics Stream to Monitor Real-time CPU Usage
https://learn.microsoft.com/en-us/previous-versions/azure/azure-monitor/app/search-and-transaction-diagnostics-redirect?tabs=transaction-search
https://learn.microsoft.com/en-us/azure/azure-monitor/profiler/profiler
https://learn.microsoft.com/en-us/azure/azure-monitor/app/app-insights-overview
If the answer is helpful, please click Accept Answer and kindly upvote it so that other people who faces similar issue may get benefitted from it.

Let me know if you have any further Queries.