Xamarin Certification Xamarin Performance Optimization

Question 1

Which tool is built into Visual Studio and used to profile CPU usage and memory allocations in Xamarin applications?

Accepted Answer

Xamarin Profiler

Answer

dotTrace

Answer

Android Profiler only

Answer

Instruments only

Question 2

What is the primary benefit of enabling XAML Compilation (XamlCompilation attribute) in Xamarin.Forms?

Accepted Answer

XAML is parsed at compile time instead of runtime, reducing page load time

Answer

It automatically generates code-behind classes

Answer

It enables hot reload on iOS devices

Answer

It compresses XAML files to reduce APK size

Question 3

Which ListView caching strategy in Xamarin.Forms reuses cell objects as the user scrolls to improve performance?

Accepted Answer

RecycleElement

Answer

RetainElement

Answer

RecycleElementAndDataTemplate

Answer

CacheElement

Question 4

What does the Xamarin Linker do when set to 'Link All' mode?

Accepted Answer

Removes unused code from SDK and user assemblies to reduce app size

Answer

Links all native libraries into a single binary

Answer

Forces all assemblies to compile with AOT

Answer

Combines multiple DLLs into one managed assembly

Question 5

Which CollectionView feature in Xamarin.Forms provides a built-in performance advantage over ListView for long data sets?

Accepted Answer

Native virtualization and cell recycling by default

Answer

Built-in pull-to-refresh

Answer

Built-in search bar

Answer

Automatic pagination

Question 6

In Xamarin.Android, which Garbage Collector mode is recommended for apps with frequent short-lived allocations to minimize GC pause times?

Accepted Answer

SGen (Generational GC)

Answer

Boehm GC

Answer

Mark-and-Sweep GC

Answer

Reference Counting GC

Question 7

What is the recommended approach to prevent memory leaks caused by event handler subscriptions in Xamarin.Forms pages?

Accepted Answer

Unsubscribe event handlers in the OnDisappearing or Dispose method

Answer

Use static event handlers throughout the app

Answer

Always use weak references for all objects

Answer

Avoid events and use polling instead