Loss of performance when packaging

Killed the charade! you were surgical in your diagnosis, congratulations!
I feel like taking a container out of my head, thanks for the dedication and generosity in this case. The curious thing is that by configuring scalability through the blueprint level, I get much better FPS rates.
I would like your opinion about Polimodels car vol 1 (Marketplace), a very well done and useful car system, however it drops at least 35 FPS from the project with only 1 car on the scene. With each car added, the performance drops even more. I contacted the developer but still did not get an answer. Do you think it is possible to correct?