Does SBT use the Fast Scala Compiler (fsc)?

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Does SBT make use of fsc?

For test purposes I am compiling a 500-line program on a fairly slow Ubuntu machine (Atom N270). Three successive compile times were 77s, 66s, and 66s.

I then compiled the file with fsc from the command line. Now my times were 80s, 25s, 18s. Better! That implies to me sbt is not using fsc. Am I right? If so, why doesn't it use it?

I may try getting sbt to explicitly use fsc to compile, though I am not sure I will figure out the config. Has anyone done this?

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