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I use the latest version of VS 2019 (16.9.1)
Xamarin.Forms 5.0.0.2012
The problem is only in Android (physical device and emulator)
In the last 2 updates of Visual Studio, I noticed that there is significant delay from building the app to deploying the app to the device (debug configuration)
I never used emulators. I was always using a physical device to test my apps.
At one point this delay became very annoying and I thought that maybe I can overcome the issue by installing an emulator.
The delay is the same with the emulator too.
There is about 7 to 8 seconds, from the moment that I see in debug window "Found device: emulator-5554" up to the moment that the app starts.
When I say "the app starts", I mean, the first blue xamarin.forms screen of a blank application.
Same behavior with a physical device.
I didn't experience the same problem before the last 2 updates of VS. Actually everything was very fast.
So the question is what is the problem and how can I correct it.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(12.8, 87%, 11%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJ%3C/text%3E%3C/svg%3E)
Hi, DimitrisMylonas-2429. I updated the VS to the lastest version and tested a basic demo on it. The project works fine, there is no obvious deply when starting the app. Try to empty the bin and obj folders of both the shared project and platform project, then test the sample again. You could also create a new blank Xamarin.Forms project to check the issue. If the problem still occurs, you could report this issue to the product team on Developer Community.
@JarvanZhang I created a new blank app and the problem still exists.
The delay is less though with an empty app.
Just to clarify the "...when starting the app" that you mentioned. My assumption is that the problem is not on the app. When the app is installed on the device (physical or emulator) runs fine with the expected response when starting. The problem is when VS after building the app, trying to deploy to the device.
The problem appeared "suddenly" after updating VS. I didn't have that problem before.
In any case, I will create an issue on the Developer Community as you suggested.
Please share the related link of the topic here? It'll help others who face the similar problem.
Hello everybody,
we in our company have the same problem. You need a lot of patience, but it would be a request as it takes a lot of time to have a solution to this problem as soon as possible.
What can we do about a WorkAround or something else?
How can we stimulate this faster?
Many Thanks
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(204.8, 11%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERK%3C/text%3E%3C/svg%3E)
Any update on this topic? I am facing the same problems. Thx Rob
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(249.60000000000002, 48%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJR%3C/text%3E%3C/svg%3E)
I also have the issue but it only seems to happen on some devices.
With an S5 it takes a long time, but an A11 takes a short time.
Good to know. I'll try some other devices.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(230.39999999999998, 65%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EES%3C/text%3E%3C/svg%3E)
Same issue here. I was running 16.9.3. Upgrading to 16.9.4 makes no difference.
Debugging starts fine, but after opening and closing a page a few times it gets sluggish.
This happens on emulators and two different physical devices.
Running the app in Release mode works fine. Looking out for any clue that can get me back to normal developing.
Hello everybody,
I think I have good news !?
Now I have installed the version MS Visual Studio 2019 - 16.10.1.
It's faster for me again :-D
Try it out and please send us a message as to whether it works again for you.
Have a good time
Markus
@Markus Krauthausen It didn't work for me!
The deployment to a physical device is still very very slow.
Didn't work for me, either. Everything still painful slow - Device or Simulator. Cannot notice a difference.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(259.20000000000005, 2%, 35%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMN%3C/text%3E%3C/svg%3E)
I'm also facing this issue on VS 2019 16.10.2
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(272, 25%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHL%3C/text%3E%3C/svg%3E)
Yesterday I update visual 2019 to version 16.10.2, bad desicion for me :(
The deploying and debuggin to android devices and emulator is painful slow, unusable for debug
Please fix tis error is very bad
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(121.6, 38%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ED%3C/text%3E%3C/svg%3E)
I also started facing this issue after I updated VS 2019 from 16.10.1 to 16.10.2
In my Android project, when I disable (Debugging options -> Enable developer instrumentation) everything start's to work fine. However, this is not a solution since this option disables debugging.
As it seems, it's not the first time that this bug occurs: https://developercommunity.visualstudio.com/t/update-1623-broke-android-debugging/714508