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Improve builder instantiation by using a constructor reference instead of class and constructor look-up. Caching the constructor per class did not provide significant wins. However, the function reference appears to provide non-trivial wins.
Over 1,000,000 executions the two strategies perform as follows:
Reflection took: 0.061923918 sec
Functional took: 0.008091248 sec
That's almost a 10x performance improvement on construction. There are of course larger issues (e.g. #1 and #2) but this was a low-cost fix with solid returns.