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POUIImage:imageWithContentsOfFile is 10 times slower in iOS 5.0
 

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    <p>After simply recompiling our iPhone application on newly released iOS 5.0 SDK i faced strange problem - all UIImage:imageNamed (first call with actual image loading) and UIImage:imageWithContentsOfFile started to work 10 times slower than before. i managed to narrow problem down: this is the case only for jpeg and png files (not gifs!) and this is not because of file size. even straightforward loading of small 32*32 png takes around 300ms... compared to 30ms on older devices (checked on 3.1 and 4.3.5 with the exact same code)</p> <p>i also tried to load image via newly introduced CIImage with this code</p> <pre><code>WLLog(@"Data loading..."); NSData *imageData = [NSData dataWithContentsOfFile:path]; WLLog(@"CIImage creation..."); CIImage* cii = [CIImage imageWithData:imageData]; WLLog(@"CIImage creation ok..."); float scle = 1.0; #if __IPHONE_OS_VERSION_MAX_ALLOWED &gt;= 40000 if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) { scle = [[UIScreen mainScreen] scale]; } #endif CIContext *context = [CIContext contextWithOptions:nil]; UIImage* res5 = [[UIImage alloc] init]; WLLog(@"UIImage creation..."); [res5 initWithCGImage:[context createCGImage:cii fromRect:cii.extent] scale:scle orientation:UIImageOrientationUp]; WLLog(@"Done!"); </code></pre> <p>without any luck... this single line</p> <pre><code>CIImage* cii = [CIImage imageWithData:imageData]; </code></pre> <p>takes the same 300ms even on small images (4Kb png). imho, there is simple nothing to parse at all!</p> <p>Is there anything to resolve such strange change in loading times? For now it looks like something changed drastically in sdk internals :(</p>
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