Frames loading

Hello, I'm trying to use animated webp images as cells for collection view and it works nice on new devices, but on devices like iPhone 7 I have such an issue: on first appearing of cell the loading of images is freezed, and scrolling is not (I can scroll the collection without freezes, so it is not main thread lock). There are approximately 50 cells of images, and they loads by frame. After some time (I guess when all frames of images are passed) all cells begin to animate correctly (after closing and reopening the screen too). Looks like it is something connected with caching. All webp-s are local files, so it is not network loading. Am doing something wrong? Here is the code:

SDWebImageManager.shared.optionsProcessor = SDWebImageOptionsProcessor { _, options, context in
    var mutableOptions = options
    mutableOptions.insert([.retryFailed, .highPriority/*, .preloadAllFrames*/]) // no efffect on frames loading

    return SDWebImageOptionsResult(options: mutableOptions, context: context)
}

SDImageCodersManager.shared.addCoder(SDImageWebPCoder.shared)
SDWebImageDownloader.shared.setValue("image/webp,image/*,*/*;q=0.8", forHTTPHeaderField: "Accept")

...

var stickerImageView = SDAnimatedImageView(frame: .zero)
// stickerImageView.shouldIncrementalLoad = true // no efffect on frames loading
stickerImageView.sd_imageTransition = .fade(duration: 0.3)

...
stickerImageView.sd_setImage(with: url, placeholderImage: placeholder)

Start by reproducing the animated WebP collection-view case with SDAnimatedImageView, SDWebImageManager, and SDImageCodersManager on an older iOS device or equivalent environment. Compare first appearance with later animation after the local images have been processed or cached. Done means the approximately 50 local animated WebP cells begin loading and animating correctly without the reported initial freeze.