[Android] In debug the app is way way slower than in xf

[roubachof]

Description

I am currently doing the maui migration of an app running on a big but slow device for an important client.
We have a big app running on a android device with tons of views.
On XF it was slow, on MAUI it seems faster, but only when all the views are constructed, during the constructions of the views (meaning when the UI thread is loaded) it takes forever.

I am experiencing a very slow debugging experience in MAUI. In XF it wasn't great but with MAUI it's about 5x times slower.

The device is an old arm 32bits, a armeabi-v7a with 4 cores:

model name      : ARMv7 Processor rev 10 (v7l)
BogoMIPS        : 7.54
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x2
CPU part        : 0xc09
CPU revision    : 10

Here is the comparison of android studio cpu profiling for the same view:

This is the XF version:

This is the maui version:

We can see that maui is 8x times slower.

On XF we can see the dispatchMessage is short and some work is done each time.

On MAUI the dispatchMessage last forever and seem to be doing nearly nothing..

Is it something weird or maybe the way the looper and handlers are used in MAUI changed a lot compared to XF?

Steps to Reproduce

No response

Link to public reproduction project repository

No response

Version with bug

8.0.7 SR2

Is this a regression from previous behavior?

Yes, this used to work in Xamarin.Forms

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

No response

Did you find any workaround?

I am developping in RELEASE mode :)

Relevant log output

No response

[jfversluis]

@jonathanpeppers ?

[jonathanpeppers]

@roubachof did you already review the section at the top of https://aka.ms/profile-maui?

Are you comparing Debug mode or Release mode?

[roubachof]

@jonathanpeppers yup, I have <UseInterpreter>false</UseInterpreter> in my csproj.

I'm comparing in DEBUG, in RELEASE performance between XF and MAUI are about the same.

[jonathanpeppers]

Did you record a .speedscope file to see what is slow?

[roubachof]

I tried but it makes the app crashes at the beginning...

[jonathanpeppers]

We are working on improving the Android docs here: dotnet/android#8713

Hi @roubachof. We have added the "s/needs-info" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment. If it is closed, feel free to comment when you are able to provide the additional information and we will re-investigate.