Android - Kotlin Serializable vs Java Serializable , is the performance the same?

Question

I have read everywhere that Java Serializable is much slower than Parcelable . Is it the same case for Kotlin Serializable? Or is Kotlin Serializable equally fast as Kotlin Parcelable? Using Serializable seems to much simpler and i wanted to know if in Kotlin its fine to use Serializable instead of Parcelable.

Answer 1

Kotlin standard library doesn't have its own definition of Serializable, if you have code using it you'll notice import java.io.Serializable. So it's exactly as fast.

There is @Serializable from kotlinx.serialization (thanks to Marko Topolnik for reminding me of it), but it works very differently and is not easier to use than @Parcelize (see below).

Using Serializable seems to much simpler

But here you have an advantage: in Kotlin it's just as easy, just use the @Parcelize annotation (see the design document as well).