Starting with macOS 10.15 I have noticed that obtaining
NSURLLocalizedNameKey, NSURLTagNamesKey, and even calling getxattr(),
can cause a significant delay.
The code below, which gets NSURLLocalizedNameKey for 3 folders, takes
1.9 seconds to execute on my system.
It appears though that it is only these 3 specific folders that has the
problem.
Furthermore, the problem only happens when I include the code below in a
GUI application which is launched via launch services. If I run the
executable directly from a terminal then the code is near instant.
I tried to sample the code, and it appears that it calls out to some OS
service/daemon. Presumably it never gets a response, and a timeout is
triggered.
I wonder if anyone else has come across this? And maybe have discovered
more info?
This is btw macOS 10.15.4 and a fairly stock system (new computer
without migrating old data), and I noticed the problem some time ago, so
it definitely existed before 10.15.4, but I never saw anything like this
before upgrading to Catelina.
NSTimeInterval startTime = NSDate.timeIntervalSinceReferenceDate;
NSArray<NSURL*>* urls = @[]
[NSFileManager.defaultManager
URLForDirectory:NSDesktopDirectory inDomain:NSUserDomainMask
appropriateForURL:nil create:NO error:nil],,
[NSFileManager.defaultManager
URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask
appropriateForURL:nil create:NO error:nil]
[NSFileManager.defaultManager
URLForDirectory:NSDownloadsDirectory inDomain:NSUserDomainMask
appropriateForURL:nil create:NO error:nil,
];
NSString* localizedName;
for(NSURL* url in urls)
[url getResourceValue:&localizedName
forKey:NSURLLocalizedNameKey error:nil];
NSLog(@"Duration %.03f", NSDate.timeIntervalSinceReferenceDate -
startTime);
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