Scala partial function composition performance

Question

Is there any difference in the performance of a partial function defined as

val matches = {
   case Match(x,y) => ...
   case AnotherMatch(x,y,z) => ...
   case x:YetAnother => ...
}

and one defined as below?

val match1 = {
   case Match(x,y) => ... 
}
val match2 = {
   case AnotherMatch(x,y,z) => ...
}
val match3 = {
   case x:YetAnother => ...
}
val matches = match1 orElse match2 orElse match3

Answer 1

The difference is about a factor of 2 if the matches are

Some(x: Int) if x > 0 => x
Some(x: Int) if x < 0 => -x
None => 0

So it can be significant in a tight loop, but often won't be.