Modifies SDWebImagePrefetcher prefetching logic. - Removes recursive calls to startPrefetchingAtIndex. - Uses dispatch_apply with striding to optimize the performance.
Modifies SDWebImagePrefetcher prefetching logic.
- Removes recursive calls to startPrefetchingAtIndex.
- Uses dispatch_apply with striding to optimize the performance.

ruaho/SDWebImage,altrooz/SDWebImage,cochat/SDWebImage,iheartradio/SDWebImage,tokorom/SDWebImage,zllbird/SDWebImage,bpoplauschi/SDWebImage,ikesyo/SDWebImage,dreampiggy/SDWebImage,awkward/SDWebImage,klundberg/SDWebImage,Frntbac/SDWebImage,dreampiggy/SDWebImage,HannaLu/SDWebImage,iMinichrispy/SDWebImage,ttgb/SDWebImage,amyhametov/SDWebImage,dpettigrew/SDWebImage,yunzhongyoulong/SDWebImage,geoffmacd/SDWebImage,twobitlabs/SDWebImage,zhang-yawei/SDWebImage,Insfgg99x/SDWebImage,mattjgalloway/SDWebImage,smule/SDWebImage,rs/SDWebImage,buleSky111/SDWebImage,Kekanto/SDWebImage,tualatrix/SDWebImage,awkward/SDWebImage,heroims/SDWebImage,odyth/SDWebImage,smyrgl/SDWebImage,iosnatarajan/SDWebImage,dreampiggy/SDWebImage,awkward/SDWebImage