Issues related to slow keychain access.

Hello Apple Developer,

I have some questions regarding slow keychain access. We recently launched a product, and users with certain specific device models have reported slow performance. I'm not sure what's causing this issue and would appreciate your help in analyzing it.When using keychain groups, I didn’t specify a group, and on some devices, the queries are particularly slow. I'm unsure of the reason for this.I’m using kSecAttrTokenIDSecureEnclave, and each time I execute SecItemCopyMatching or SecItemDelete, the operation is particularly slow, taking around 2 seconds.It’s strange that when setting the default keychain group (team ID + bundle ID), the access is not slow. However, since the project has enabled the keychain group, if I set a keychain group, I cannot access the data that was stored before setting the keychain group.

Here is a snippet of my code:

    NSMutableDictionary *parameters = [[NSMutableDictionary alloc] initWithObjectsAndKeys:(__bridge id)kSecAttrTokenIDSecureEnclave,(__bridge id)kSecAttrTokenID,
                                   (__bridge id)kSecAttrKeyTypeEC,(__bridge id)kSecAttrKeyType,
                                   @256,(__bridge id)kSecAttrKeySizeInBits,
                                   PrivateKeyAttrs,(__bridge id)kSecPrivateKeyAttrs,nil];


privateKey = SecKeyCreateRandomKey((__bridge CFDictionaryRef)parameters, &error);

Here is a search of my code:

SecKeyRef privateKey = NULL;
//CFTypeRef *private = &privateKey;
NSDictionary *query = nil;

query = @{
    (__bridge id)kSecClass: (__bridge id)kSecClassKey,
    (__bridge id)kSecAttrApplicationTag: serviceID,
    (__bridge id)kSecReturnRef: @YES
};

OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)query, (CFTypeRef *)&privateKey);

if (privateKey) {
    
    CFRelease(privateKey);
    
}