Performance problem

i have tried to insert in my android game ( fully blueprint ) a c++ class for test performance. My game before this operation worked between 30 and 40 fps. When i have insert c++ class and i have compiled my game with visual studio 2013, my game works between 20 and 30 fps… my c++ class has never been used in game… what could be the problem?

Thanks in advance.

anyone can help me please?

Just shooting in the dark, is it possible your c++ build is in “development” configuration and your blueprint only build is in “shipping” configuration? That’ll explains the performance difference.