Passing array from blueprint to C++ causes performance drop

Passing a blueprint array as an argument to a C++ function causes a spike in Frame rate, game and GPU. This spike is noticeable when using UnitGraph.

Attached screenshots show difference in UnitGraph between 4.7.6 and 4.9.

1. Open and unzip attached project
2. Open the project (4.7.3 by default) and PIE
3. Enter "stat UnitGraph" console command
4. Press T to run the C++ function through the level blueprint
5. Save/close project
6. Right click on .uproject and switch engine version to 4.9
7. Reopen the project and PIE
8. Enter stat UnitGraph command again
9. Press T to run C++ function

Result:
Jump in graph output indicating drop in performance.

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