Android studio, application slows down on android 4.3?

Question

Android

I launched and tested the application on 4.1.2, everything worked with a bang, quickly and without lags (launched through run 'app'). I made a build-> Make project to test it on a friend's phone (samsung galaxy s4) - it's terribly slow, even simple clicks on standard buttons react in a second. A couple of days later, my phone was updated to 4.3, the same interface brakes appeared.
// build.gradle code:
apply plugin: 'android'
android {
compileSdkVersion 19
buildToolsVersion "19.0.1"
defaultConfig {
minSdkVersion 11
targetSdkVersion 19
versionCode 1
versionName "1.0"
}
buildTypes {
release {
runProguard false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
}
dependencies {
compile 'com.android.support:appcompat-v7:+'
compile fileTree(dir: 'libs', include : ['*.jar', '*.aar'])
}

Answer 1

actually what is the reason and most importantly how to remove it?