CATiledLayer in iPad retina simulator yields poor performance

Question

I\'m hoping maybe this is just an issue with the simulator but of course it has me worried since I have already submitted my retina capable apps and there\'s no way to test

Answer 1

The performance on iPad3 of all TiledLayers is worse than on iPad2 - that's also visible in the GoogleMaps app.

However, the best performance you get by adding the following changes to your UIView class that uses CATiledLayer

- (id)initWithFrame:(CGRect)frame tileSize:(CGSize)tileSize
{
    self = [super initWithFrame:frame];
    if(self)
    {
        CATiledLayer *animLayer = (CATiledLayer *) self.layer;
        animLayer.levelsOfDetail = 5;
        animLayer.levelsOfDetailBias = 3;
        animLayer.tileSize = tileSize;

        // adjustments for retina displays
        if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] == YES && [[UIScreen mainScreen] scale] == 2.00)
        {
            animLayer.contentsScale = 1.0;
            self.contentScaleFactor = .5;
            animLayer.shouldRasterize = NO;
            animLayer.levelsOfDetailBias ++;
        }
    }
    return self;
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] == YES && [[UIScreen mainScreen] scale] == 2.00)
    {
        self.contentScaleFactor = .5;
    }
}

There are other options to achieve the same result visually ie increasing tileSize but the performance will be much worse.