uicollectionview - How to increase the speed of loading images to UIImageView using AFNetworking in iOS -

i have collectionview , inside collectionview cell has uiimageview. used afnetworking load images web service.but takes more time load data.is there way speed process. have attached code. hope help.

//loading data

- (void)loadcategorydata {     post = nil;     nsstring *mainurl = [nsstring stringwithformat:@"some url"];     afhttprequestoperationmanager *manager = [afhttprequestoperationmanager manager];     manager.responseserializer.acceptablecontenttypes = [manager.responseserializer.acceptablecontenttypes setbyaddingobject:@"text/html"];     [manager get:mainurl parameters:nil success:^(afhttprequestoperation *operation, id responseobject) {          posts = (nsdictionary *)responseobject;         post = [nsmutablearray array];         for(nsdictionary *all in posts)         {             categories *category = [categories new];             category.title = [all objectforkey:@"catname"];             category.firsturl = [all objectforkey:@"url"];              [self.maincollectionview reloaddata];             //call images              imagespost = nil;             nsstring *imageurl = [nsstring stringwithformat:@"%@", category.firsturl];             afhttprequestoperationmanager *managerone = [afhttprequestoperationmanager manager];             [managerone get:imageurl parameters:nil success:^(afhttprequestoperation *operation, id responseobject) {                    imagesposts = (nsdictionary *)responseobject;                 nsarray *resultone = [imagesposts objectforkey:@"posts"];                 imagespost = [nsmutablearray array];                 if ([resultone count]) {                     nsdictionary *firstpost = resultone[0]; //                    categories *newmogocat = [categories new];                      nsdictionary *thumbnail_images = [firstpost objectforkeyedsubscript:@"thumbnail_images"];                     nsdictionary *thumbnail = [thumbnail_images objectforkey:@"thumbnail"];                     category.imageoneurl = [nsstring stringwithformat:@"%@",[thumbnail objectforkey:@"url"]]; //                    nslog(@"%@", newmogocat.imageoneurl); //                    [imagespost addobject:newmogocat];                      [post addobject:category];                      [self.maincollectionview reloaddata];                 }              } failure:^(afhttprequestoperation *operation, nserror *error) {              }];           }      } failure:^(afhttprequestoperation *operation, nserror * responseobject) {      }]; } 

// assign values collectionview cell

- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath {     categorycollectionviewcell *cell = [collectionview dequeuereusablecellwithreuseidentifier:@"cellidentifier" forindexpath:indexpath]; //    cell.layer.borderwidth = 2.0f;     cell.layer.maskstobounds = no;     cell.layer.cornerradius = 5.0;     cell.layer.bordercolor = [uicolor purplecolor].cgcolor;     cell.layer.shadowoffset = cgsizemake(0, 1);     cell.layer.shadowradius = 2.0;     cell.layer.shadowcolor = [uicolor bluecolor].cgcolor;       [cell addsubview:cell.maintitlelabel];      categories *cat = [post objectatindex:indexpath.row];     [self.maincollectionview reloadinputviews];     cell.maintitlelabel.text = [nsstring stringwithformat:@" %@ ", cat.title];     [cell.maintitlelabel sizetofit];           nsstring *mainstring = [nsstring stringwithformat:@"%@", cat.imageoneurl];     nsurl *url = [nsurl urlwithstring:mainstring]; //    nslog(@"%@", mainstring);       [cell.mainimageview setimagewithurl:url placeholderimage:nil];         return cell; } 

import "uiimage + afnetworking.h"

inside - (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath

nsurlrequest *req = [nsurlrequest requestwithurl:[nsurl urlwithstring:cat.imageoneurl]]; [edit] :   __weak categorycollectionviewcell *weakcell = cell; [edit] [cell.articlethumbnail setimagewithurlrequest:req placeholderimage:[uiimage imagenamed:@"placeholder.png"] success:^(nsurlrequest *request, nshttpurlresponse *response, uiimage *image) {    [edit] weakcell.articlethumbnail.image = image; } failure:^(nsurlrequest *request, nshttpurlresponse *response, nserror *error) {     [edit] weakcell.articlethumbnail.image = [uiimage imagenamed:@"placeholder.png"]; }]; 

hope helps