Very slow opening of picker when media is over 8K

[Ava8]

I have two devices, on each is over 8K media, so when I open assets picker, I wait for а minute or more for loading image gallery.

[Ashu]

I am having the same issue.

[DragonCherry]

@Ava8, @Ashu
Can you please upload such images that causing the bug? I've tested with 10 images over 9MB but couldn't reproduce the problem.

[Ava8]

@DragonCherry I'm talking not about the quality but a count of photos and videos in the media library. So, my library is over 8000 photos and videos.

[DavidBoyes]

I looked in to this briefly, I currently use a different library which opens instantly where as this takes a few seconds before opening. I think it's due to the asset manager doing too much upfront. it loads every album and does an asset fetch request for each one.

[DragonCherry]

@Ava8, @Ashu , @DavidBoyes
I couldn't reproduce it with iPhone 6+, over 10,000 images. "fetchAlbums" finished in very short time. Anyone can provide a fix for them?

[DavidBoyes]

I use an iPhone XS Max. ~36,000 images, iCloud enabled. Definitely noticeably slower than other libraries I have used to initially open. I'm looking in to it now. fetchAlbums takes around 0.9 seconds to complete and selectAlbum around 1.4 seconds.

Overall it can take 2.5-3.5 seconds to complete viewDidLoad in AssetsPhotoViewController.

Update:
func select(album newAlbum: PHAssetCollection) -> Bool
Copying each asset of the fetchResult in to the array is the cause of slowness for this function I believe.

Update 2:
creating the fetchMap is the next slow piece.

I removed it from the code, as well as the assetArray. This took the viewDidLoad method down to 0.12 seconds to complete. The assetArray was replaced by just using the fetchRequest directly. However syncing changes had to be commented out for this to work. I have moved the creation of fetchMap to be more on demand in
fetchResult(forAlbum album: PHAssetCollection). I've had to move the creation of sortedAlbumsArray to a background thread as well. My version is currently quite different to the original due to requirements for my app so I hope these descriptions help out somehow.

[Ashu]

This issue occurred to me on a iPhone X. Currently, I don't have that device, so can't share much info about it. It works perfectly fine on my iPhone 5s with 5000 images. Also works in iPhone 6. I guess this issue occurs only on newer phones. Need to check again in new devices. Will let you know soon.

[DavidBoyes]

@Ashu Is that comparing with the same image set on all devices?

[Ashu]

@Ashu Is that comparing with the same image set on all devices?

No. The image set was different. iPhone X was used by professional photographer, so it might have some RAW images. I need to check that.

[DavidBoyes]

@Ashu Is that comparing with the same image set on all devices?

No. The image set was different. iPhone X was used by professional photographer, so it might have some RAW images. I need to check that.

Ok, I tried on an iPhone 6S with ~5000 images, and it was faster but I would guess relative to the amount of images/albums rather than a device specific thing.

[rad182]

have the same issue iPhone XS having 4k++ photos. opening picker takes ~3secs.
any workaround for this?

[DavidBoyes]

A work around that removes some of the delay (not all) is to move fetchAlbums to a background thread. You'll have to manually specify the defaultAlbum in fetchAssets() so it loads the initial set of photos.