Problem

After updating to Android14 and developing our app, we found that the debuggable app is very lag.

If setting android:debuggable=false, it's back to normal

Verify

I write a simple demo which you can view it from the attachment. And test 3 methods:

1. Fibonacci sequence
2. String.charAt
3. Double.parseDouble

The result like below:

Test Fibonacci sequence

Code:

private fun testFib() {
    measureTimeMillis {
        fib(36)
    }.let {
        Log.d("test", "test Fib spend: $it")
    }
}

private fun fib(n: Int): Int {
    return if (n <= 1) {
        1
    } else {
        fib(n-1) + fib(n-2)
    }
}

Result

Test String.charAt

Code

private fun testString() {
    val items = (1..1000000).map {
        "${it}.0001"
    }
    measureTimeMillis {
        items.forEach { str ->
            val length = str.length
            (0 until length).forEach {
                str[it]
            }
        }
    }.let {
        Log.d("test", "test String spend: $it")
    }
}

Result

Test Double.parseDouble

Code

private fun testDouble() {
    val items = (1..1000000).map {
        "${it}.0001"
    }
    measureTimeMillis {
        items.forEach { str ->
            val d = str.toDouble()
        }
    }.let {
        Log.d("test", "test Double spend: $it")
    }
}

Result

Conclusion

From the results, we can found there have performance loss in Android 14 with debuggable. It make our debuggable app lag.

Expect

This behavior affects our development efficiency and we can hardly develop and use it.

Is this expected behavior or is it a bug?

BTW: This behavior like app is debugging, and app run slow Is it caused by some logic about adb jdwp?

Demo

Please check the HelloAndroid.zip

And you can change the isDebuggable value in app/build.gradle.kts (or search TODO keyword)

isDebuggable = true // TODO: change it