No screen during slow start-up for Blazor Hybrid App

Mark Greenwood 16

I am creating a Hybrid Blazor Maui app - during the startup we use a configuration builder to load in Application Config hosted in Azure - that process can take around 10 seconds to complete - we don't have that much data in App Config to be fair but for some reason it's taking this long for the configurationBuilder.Build() to execute.

During this time there is NO visible screen or anything to indicate that the application is running / starting. Once the screen is up of course it all starts working as exepected.

I have searched to see if people have similar issues but cannot find anything specific where the Sevices are being constructed and that taking a while to complete....

JasonPan - MSFT 4,366 Reputation points Microsoft Vendor

2022-07-04T02:53:13.327+00:00
Hi @MarkGreenwood-0092

In order to better help you solve the problem, we have several key points to confirm with you.

Does creating default empty project run so slow on any device?

What device is the current application running on?

Please confirm whether it is the first time to start up so slow? Will it be quick to run again?

If you like, provide us with a partial snippet of how to read configuration from azure, taking care to hide confidential information.

Best Regards
Jason
Mark Greenwood 16 Reputation points

2022-07-04T08:23:41.383+00:00
Hi - I managed to solve the issue by moving the Configuration build to the OnInitialized of the primary page - that way the App loads and will happily display a 'splash screen' whilst that first page instantiates.

Not perfect but it works.

However for completeness to your questions above

No an empty project works fine - it was the ConfigurationBuilder.Build() that was taking the time, as it connects to Azure, gets credentials etc

Windows 10 machine - Gen 10 i7 with 32gb of ram

Happens every time during startup IF you have a ConfigurationBuilder connecting to Azure in there...

As noted - I have resolved this for now - but having a way for the app to at least start and show a 'splash screen' etc before the MauiApp is created would be good....
JasonPan - MSFT 4,366 Reputation points Microsoft Vendor

2022-07-04T10:05:48.093+00:00

Hi @MarkGreenwood-0092

Thanks for your reply.

Glad you currently have an alternative. If we need further help, we can use blazor and Azure App Configuration directly without using MAUI to check the running speed to rule out the problem caused by MAUI. If we can provide some code about configurationBuilder.Build(), we can further analyze the problem.

Best Regards
Jason