Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/6256#issuecomment-103641012
After some more offline discussion with @yhuai we decided to remove the
unnecessary calls to `Utils.getCallSite` as well, which collectively took up to
another `5s` in his `12.6s`. If we skip all of these calls for internal RDDs we
may notice another significant speedup.
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