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When opening a big file (for example with VLC or QuickTime) this message pops up for lots of seconds (different durations for each file):

enter image description here

I use encryption on iMac 5K.

> diskutil list      
/dev/disk0 (internal, physical):      
   #:                       TYPE NAME                    SIZE       IDENTIFIER                                                                            
   0:      GUID_partition_scheme                        *121.3 GB   disk0    
   1:                        EFI EFI                     209.7 MB   disk0s1  
   2:          Apple_CoreStorage Macintosh HD            121.0 GB   disk0s2  
   3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3  

/dev/disk1 (internal, physical):      
   #:                       TYPE NAME                    SIZE       IDENTIFIER                                                                            
   0:      GUID_partition_scheme                        *1.0 TB     disk1    
   1:                        EFI EFI                     209.7 MB   disk1s1  
   2:          Apple_CoreStorage osbase                  999.3 GB   disk1s2  
   3:                 Apple_Boot Recovery HD             650.0 MB   disk1s3  

/dev/disk2 (internal, virtual):       
   #:                       TYPE NAME                    SIZE       IDENTIFIER                                                                            
   0:                  Apple_HFS osbase                 +999.0 GB   disk2    
                                 Logical Volume on disk1s2                   
                                 3FJJCF5F-52AB-4A26-ACD7-0B80032V9CAE        
                                 Unlocked Encrypted                          
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  • 2
    Apparently there is no APFS volume in your system.
    – klanomath
    Oct 1, 2017 at 16:01
  • 1
    APFS does not convert (nor support) Fusion Drives. support.apple.com/en-us/HT208018
    – Allan
    Oct 1, 2017 at 16:07
  • If you don't need your drive to be encrypted, turning off FileVault should remove this delay.
    – Tuesday
    Oct 3, 2017 at 18:19
  • 1
    I don't use encryption and have the same issue no matter what FS type my drive has, it always checks movie before opening and it's annoying me a lot...
    – C0DEF52
    Oct 8, 2017 at 18:18

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