When opening Fenix with an app link intent, this starts the Android sampling profiler. When opening the settings panel, the profiler is stopped and the result is dumped to /sdcard/Android/data/org.mozilla.fenix.performancetest/files/fenix.trace. The trace files can be opened with the profiler in Android Studio.

fenix-sampling-profiler-intent.diff

diff --git a/app/build.gradle b/app/build.gradle
index 1f1926a2..5ed912b2 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -64,17 +64,18 @@ android {
             applicationIdSuffix ".fenix.debug"
             manifestPlaceholders.isRaptorEnabled = "true"
             resValue "bool", "IS_DEBUG", "true"
             pseudoLocalesEnabled true
         }
         forPerformanceTest releaseTemplate >> { // the ">>" concatenates the raptor-specific options with the template
             manifestPlaceholders.isRaptorEnabled = "true"
             applicationIdSuffix ".fenix.performancetest"
-            debuggable true
+            buildConfigField "boolean", "USE_RELEASE_VERSIONING", "true"
+            signingConfig signingConfigs.debug
         }
         fenixNightly releaseTemplate >> {
             applicationIdSuffix ".fenix.nightly"
             buildConfigField "boolean", "USE_RELEASE_VERSIONING", "true"
         }
         fenixBeta releaseTemplate >> {
             applicationIdSuffix ".fenix.beta"
             buildConfigField "boolean", "USE_RELEASE_VERSIONING", "true"
diff --git a/app/src/main/java/org/mozilla/fenix/IntentReceiverActivity.kt b/app/src/main/java/org/mozilla/fenix/IntentReceiverActivity.kt
index 05b917ee..99c30613 100644
--- a/app/src/main/java/org/mozilla/fenix/IntentReceiverActivity.kt
+++ b/app/src/main/java/org/mozilla/fenix/IntentReceiverActivity.kt
@@ -2,16 +2,17 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 package org.mozilla.fenix
 
 import android.app.Activity
 import android.content.Intent
 import android.os.Bundle
+import android.os.Debug
 import androidx.annotation.VisibleForTesting
 import kotlinx.coroutines.MainScope
 import kotlinx.coroutines.launch
 import mozilla.components.feature.intent.processing.IntentProcessor
 import org.mozilla.fenix.components.IntentProcessorType
 import org.mozilla.fenix.components.getType
 import org.mozilla.fenix.components.metrics.Event
 import org.mozilla.fenix.ext.components
@@ -23,16 +24,18 @@ import org.mozilla.fenix.shortcut.NewTabShortcutIntentProcessor
  * Processes incoming intents and sends them to the corresponding activity.
  */
 class IntentReceiverActivity : Activity() {
 
     @VisibleForTesting
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
+        Debug.startMethodTracingSampling("fenix.trace", 8*1024*1024, 5000)
+
         MainScope().launch {
             // The intent property is nullable, but the rest of the code below
             // assumes it is not. If it's null, then we make a new one and open
             // the HomeActivity.
             val intent = intent?.let { Intent(intent) } ?: Intent()
             intent.stripUnwantedFlags()
             processIntent(intent)
         }
diff --git a/app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarController.kt b/app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarController.kt
index 5c64120a..37eb970a 100644
--- a/app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarController.kt
+++ b/app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarController.kt
@@ -1,16 +1,17 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 package org.mozilla.fenix.components.toolbar
 
 import android.app.Activity
 import android.content.Intent
+import android.os.Debug
 import androidx.annotation.VisibleForTesting
 import androidx.navigation.NavController
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 import com.google.android.material.snackbar.Snackbar
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.MainScope
@@ -128,16 +129,17 @@ class DefaultBrowserToolbarController(
         trackToolbarItemInteraction(item)
 
         Do exhaustive when (item) {
             ToolbarMenu.Item.Back -> sessionUseCases.goBack.invoke(currentSession)
             ToolbarMenu.Item.Forward -> sessionUseCases.goForward.invoke(currentSession)
             ToolbarMenu.Item.Reload -> sessionUseCases.reload.invoke(currentSession)
             ToolbarMenu.Item.Stop -> sessionUseCases.stopLoading.invoke(currentSession)
             ToolbarMenu.Item.Settings -> browserAnimator.captureEngineViewAndDrawStatically {
+                Debug.stopMethodTracing()
                 val directions = BrowserFragmentDirections.actionBrowserFragmentToSettingsFragment()
                 navController.nav(R.id.browserFragment, directions)
             }
             ToolbarMenu.Item.Library -> browserAnimator.captureEngineViewAndDrawStatically {
                 val directions = BrowserFragmentDirections.actionBrowserFragmentToLibraryFragment()
                 navController.nav(R.id.browserFragment, directions)
             }
             is ToolbarMenu.Item.RequestDesktop -> sessionUseCases.requestDesktopSite.invoke(