Doubt of performance, if you repeat save and load game in a short time.

Hello, I will try to explain this with my primitive English.

I have created an Android game with google play achievements.
And for example in this image, I have created that the variable “renosmuertossavegame” that is inside a bluerpint type savegame, and every time I kill an enemy, that variable is loaded and saved, in this game you kill enemies every 1 or 2 seconds.
Do you think this will affect much the performance in a mobile game?
Is there any better way to do this?