Why does a css file embedded in a DLL take 50.9ms to 9.4s to load?

David Thielen 3,121

Hi all;

I have a Blazor server app running on Azure app server. I am using Application Insights to measure performance and as I am new to Application Insights, this may be a user error.

I have MudBlazor referenced in App.razor as:

<link href="_content/MudBlazor/MudBlazor.min.css" rel="stylesheet" />

I believe this means it is reading it out of the MudBlazor.dll which is a local disk read from a local file.

Application Insights shows the time for 'GET /_content/MudBlazor/MudBlazor.min.css` to be, in order: 9.4s, 1.6s.153.9ms, 50.9ms.

These times are, I believe, the server responding to a client browser that is requesting it. These are all the same browser.

My question is why so long? Even 50.9 strikes me as high for something embedded in a local file. (A separate question is why is the browser re-requesting the file. But that's a distinct issue for another question.)

thanks - dave

JasonPan - MSFT 5,891 Reputation points Microsoft Vendor

2024-07-22T08:00:53.66+00:00
Hi @David Thielen,

After checking the publish files, I found the MudBlazor.min.css file under wwwroot folder, it's not read from MudBlazor.dll.

Based on my understanding of the web server and the test results of my local VS2022, I think that the time to read a 567k size MudBlazor.min.css should be related to the performance of the web server and the network environment. The time of my local test is around 600ms, and the first load will take a bit long.

In addition, the following line of code, according to the official documentation, should be added in _Host.cshtml, not in App.razor.

<link href="_content/MudBlazor/MudBlazor.min.css" rel="stylesheet" />

Best Regards

Jason
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1 answer

Bruce (SqlWork.com) 66,056 Reputation points

2024-07-22T16:04:04.9633333+00:00

in the standard configuration the static file handle would return the file. this should be quick, so my guess is that you have caching turned off in the browser, and your requests are going to different web servers (not over the keep alive session - check with browser debug tools). and the delay is the server spinning up.
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David Thielen 3,121 Reputation points

2024-07-25T16:22:30.7666667+00:00

@Bruce (SqlWork.com) I checked, caching is on. Also, even if it was off, that still would not explain taking 9 seconds to load this css file. Something weird is going on here.

thanks - dave
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Why does a css file embedded in a DLL take 50.9ms to 9.4s to load?

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