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Improve Performance of fJVT Tool

William Keaton Balunas requested to merge wbalunas/athena:atljetmet-814 into 21.2

The fJVT tool currently has inefficient behavior where it re-calculates the full set of vertex momenta for each jet in the container whenever modify(...) is called. The result is exactly the same each time; it only needs to be done once. This just moves the function call to outside the loop over jets to avoid wasting CPU on repeating the calculation many times.

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