Lowering FPS on playEffect()

cocos2d-x C++
#1

In my game FPS falls from 59-60 to 45-46 when using playEffect(). Is that OK?

In HelloWorldScene.cpp I preloading effect:

#define EFFECT_FALL “Effects/Fall.wav”
CCScene* HelloWorld::scene()
{
CCScene scene = CCScene::create;
HelloWorldlayer = HelloWorld::create();
scene->addChild(layer);
SimpleAudioEngine::sharedEngine()->preloadEffect(EFFECT_FALL);

}

and then i use it:

SimpleAudioEngine::sharedEngine()->playEffect(EFFECT_FALL);

what am I doing wrong?