Application Sticks on Osspinlocklockslow

GCD and OSSpinLockLock

my tought is that some timeout or failure blocks your gcd queues for too much time. try rewriting that code with NSOperationQueue, that way you can stop the queue on errors or view/controller going away.

https://developer.apple.com/library/ios/documentation/Cocoa/Reference/NSOperationQueue_class/index.html

Update 1:

Here is my trial at your code, i added queue and logs, check them and also check the timeout value. This way if a request does not finish (most likely) you can trace it. All requests are serial so if one of them stops you should immediately notice it.
You can create more than one queue and access them sequentially (round robin) to have more requests simultaneously. I would not go with more than 4 queues which is also the default for most desktop internet browsers.

// keep the same queue for all request (class member?), don't put it in the same block
NSOperationQueue* queue= [[NSOperationQueue alloc] init];

// keep this in another code block from queue
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0ul), ^(void) {
 [[InstagramEngine sharedEngine] getMediaAtLocation:location count:kInstagramLocationBufferSize maxId:nil withSuccess:^(NSArray* media, InstagramPaginationInfo* paginationInfo) {
     if (media && media.count>0) {
         for (InstagramMedia* mediaObject in media) {
             NSURL* url= mediaObject.standardResolutionImageURL;
             NSLog(@"Start loading from %@", url);
             NSURLRequest* req= [NSURLRequest requestWithURL:mediaObject.standardResolutionImageURL
                                                                                     cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                                             timeoutInterval:30]; // 30 seconds timeout
             [NSURLConnection sendAsynchronousRequest:req queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
                 NSLog(@"Stop loading from %@ %@ %@", url, response, connectionError);
                 if (data != nil && connectionError == nil) {
                     UIImage* img = [UIImage imageWithData:data];
                     if (img) {
                         // if you are triggering some ui update run on main thread
                         // [self.locationBuffer addObject:img];
                         [self.locationBuffer performSelectorOnMainThread:@selector(addObject:)
                                                                                                     withObject:img
                                                                                                waitUntilDone:NO];
                     }
                 }
             }];
         }
     }
 } failure:^(NSError *error) {
     NSLog(@"Error getting media list: %@", error);
 }];
});

What does toast mean?

A small informational message that pops up like toast.

http://en.wikipedia.org/wiki/Toast_(computing)

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