ios - why is PHPhotoLibrary performChanges creationRequestForAssetFromVideoAtFileURL so slow? -

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i'm measuring times tens of seconds minutes depending on size of video. shouldn't change request fast (local flash disk copy/meta data/checksums) adds local video photolibrary/camera roll? this issue appears occur when icloud backups turned on. haven't been able find helpful information through web search or apple dev docs.

sample code:

    func exportassettophotolibrary(videourl: nsurl, _ exportedasset: (localidentifier: string) -> void) {         var localidentifier = ""         var starttime = nsdate.timeintervalsincereferencedate()         phphotolibrary.sharedphotolibrary().performchanges({             let assetrequest = phassetchangerequest.creationrequestforassetfromvideoatfileurl(videourl)             let assetplaceholder = assetrequest.placeholderforcreatedasset             localidentifier = assetplaceholder.localidentifier         },         completionhandler: { success, error in                 var elapsedtime: nstimeinterval = nsdate.timeintervalsincereferencedate() - starttime                 nslog("exported cameo video photo library \(elapsedtime)")                 exportedasset(localidentifier: localidentifier)         })     }


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