Blazor Server App running slow locally

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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I have an ASP.NET Blazor Server app that is using .NET 8. When I run the app locally it's very slow compared to the app on the server. By very slow I mean it takes almost 20 seconds to fully load the main page. Out on the server the app loads just fine. There is data being loaded from a database, but I wrote messages to the console right before getting the data and right after and that process is less than 2 seconds. I've tried running in Release and disabling Hot Reload but that does not change the slow loading time. I'm using Firefox as my browser and using the developer tool network tab took a screenshot of the app when it initially loads. There are a handful of requests listed that are taking longer than it takes me to get my data. Anyone have any ideas or experienced this before?

I should also mention, this problem has been occurring for me on 2 different computers. I recently got a new machine for work and had to reinstall Visual Studio and was hoping this would resolve the issue. But it still happens. I also recently upgraded my home internet (I work from home) from 25Mbps to 300Mbps down. So, I have a fresh install of Visual Studio and faster internet and still experience extreme slowness with this Blazor app. Other MVC web apps work fine.

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Original Comments

Feedback Bot on 10/23/2025, 06:55 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

[javiercn]

Thanks for contacting us.

• Do you have that problem if you run the application from the command line?
• Can you give us more details about what you mean by slow in this context and what is the delta you are observing?
• Can you capture a timestamp at application startup (Program.cs) and when the page renders?

[esr124]

I have tried running the app from the command line but it never gets past the message "Building...". I'm not sure if this is related to https, the AzureAD authentication, or something else. As far as the difference between running within Visual Studio locally and out on the server with IIS, its extremely noticeable. It's around 20 seconds to load. The screen shot I provided shows the time it takes to get the requests. And the page only takes 1-2 seconds to load on from the server.

[javiercn]

@esr124 thanks for the additional details.

If you publish and run the app locally, do you encounter the same problem?

[esr124]

Publishing the app locally is cumbersome due to permissions restrictions on my work machine. I dont have permissions to install IIS on my work machine. The app uses NLog to log message down to Trace level for both the app on the server and running the app locally. The logs are saved to the same database. I can provide logs for loading the main page and clicking a user to load their individual bio page. Is it okay to provide those log files here?

[javiercn]

@esr124 thanks for the additional details.

Can you capture a timestamp at application startup (Program.cs) and another one when the page renders?

Have you tried running the app without debugging to see if that makes a difference? (CTRL+F5).

I'm trying to see if we can understand where and why your slowdown is happening.