Initialization of scala.Predef class is lazy heavyweight operation which may cause unexpected slowdown of application and will become a trouble in situations when timing matters (like programming contests).
val a = new Array[Integer](10)
a(5) = 3 //slowdown on this line
So can I turn off it's laziness and force scala.Predef initialization on application start using only scala compiler or VM options without making changes in the code?
No you can't. You can initialize an object by calling it, like this
Predef // ensures the body of Predef is initialized
val a = new Array[Integer](10)
a(5) = 3
Still, you will probably not have initialized the ArrayOps class which is involved in a.apply. Lazy class initialization is a property of the JVM. If you do benchmarks, that's why you usually give it a "warmup" run first, so that all involved classes have been loaded first.
