Answer by elm for Read entire file in Scala?

For faster overall reading / uploading a (large) file, consider increasing the size of bufferSize (Source.DefaultBufSize set to 2048), for instance as follows,

val file = new java.io.File("myFilename")io.Source.fromFile(file, bufferSize = Source.DefaultBufSize * 2)

Note Source.scala. For further discussion see Scala fast text file read and upload to memory.