Untitled

Improving Performance of CALayer Filters
CIFilter *blurFilter = [CIFilter filterWithName:@"CIDiscBlur"];
    [blurFilter setDefaults];
    [blurFilter setValue:(id)[NSNumber numberWithFloat:15.0] forKey:@"inputRadius"];

    dotFilters = [[NSArray arrayWithObjects:(id)blurFilter, nil] retain];

    CGColorRef purpleColor = CGColorCreateGenericRGB(0.604, 0.247, 0.463, 1.0);

    CALayer *dot = [[CALayer layer] retain];
    dot.backgroundColor = purpleColor;
    dot.cornerRadius = 15.0f;
    dot.filters = dotFilters;

    NSRect screenRect = [[self.window screen] frame];

    //  10 point border around the screen

    CGFloat width = screenRect.size.width - 20;
    CGFloat height = screenRect.size.height - 20;

    #define ARC4RANDOM_MAX      0x100000000
    width = ((CGFloat)arc4random() / ARC4RANDOM_MAX) * width + 10;
    height = ((CGFloat)arc4random() / ARC4RANDOM_MAX) * height + 10;

    dot.frame = CGRectMake(width, height, 20,20);//30, 30);


    [dot addSublayer:dotsLayer];