try accelerate gpu and other option to optimize device's booting

azure-pipelines.yml

@@ -42,7 +42,7 @@ jobs:
             sed -i 's/^\(hw.ramSize=\).*$/\12048M/' ~/.android/avd/xamarin_android_emulator.avd/config.ini
             # solution from https://stackoverflow.com/a/16402304 to fix error "System UI is not responding"
             sed -i 's/^\(hw.mainKeys=\).*$/\1yes/' ~/.android/avd/xamarin_android_emulator.avd/config.ini
-            nohup $ANDROID_HOME/emulator/emulator -avd xamarin_android_emulator -gpu host -skin 1080x1920 -no-snapshot -no-audio -no-boot-anim -accel auto -gpu auto -qemu > /dev/null 2>&1 &
+            nohup $ANDROID_HOME/emulator/emulator -avd xamarin_android_emulator -delay-adb -gpu swiftshader_indirect -no-window -skin 1080x1920 -no-snapshot -no-audio -no-boot-anim -accel auto -qemu > /dev/null 2>&1 &
             $ANDROID_HOME/platform-tools/adb wait-for-device shell 'while [[ -z $(getprop sys.boot_completed) ]]; do sleep 1; done; input keyevent 82'
 
             $ANDROID_HOME/platform-tools/adb devices