FPS lowering issue while using Cocos2D Particle Effects in CCTouchesMoved

Question

This is the code I have been using in CCTouchesMoved for producing Particle Effects in the touching locations. But while using this FPS is dropping to 20 while touches is moving! I have tried lowering the life and duration of particles (you can see that in code).....

How can I fix that FPS lowering issue on touches moved while using particle effects???

- (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{   
    UITouch *touch = [touches anyObject];
    location = [touch locationInView:[touch view]];
    location = [[CCDirector sharedDirector] convertToGL:location];

    swipeEffect = [CCParticleSystemQuad particleWithFile:@"comet.plist"];

    //Setting some parameters for the effect
    swipeEffect.position = ccp(location.x, location.y);

    //For fixing the FPS issue I deliberately lowered the life & duration
    swipeEffect.life =0.0000000001;
    swipeEffect.duration = 0.0000000001;

    //Adding and removing after effects
    [self addChild:swipeEffect];
    swipeEffect.autoRemoveOnFinish=YES;
}

Please help me out... I tried with different particles & minimizing the life and duration, but didn't work! Any new ideas for that ? or fixes for what I have done?

Answer 1

I highly suspect the reason for the slowdown is because you are instantiating a new CCParticleSystemQuad every time the touch moves. Why not just instantiate it once in the init or ccTouchesBegan method but only set the position and emissionRate in ccTouchesMoved:

- (id)init {
   ...

   swipeEffect = [CCParticleSystemQuad particleWithFile:@"comet.plist"];
   swipeEffect.emissionRate = 0;
   [self addChild:swipeEffect];

   ...
}

- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
   swipeEffect.emissionRate = 10;
}

- (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
   UITouch *touch = [touches anyObject];
   CGPoint location = [touch locationInView:[touch view]];
   location = [[CCDirector sharedDirector] convertToGL:location];
   swipeEffect.position = location;
}

- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
   swipeEffect.emissionRate = 0;
}