Why my tableview is slow?

Question

im making a tableview loaded with some NSArrays, the cell contains two labels and a background image view loaded with a URL image. The problem is that the scrolling of the table

Answer 1

load your image like this

//get a dispatch queue
dispatch_queue_t concurrentQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
//this will start the image loading in bg
dispatch_async(concurrentQueue, ^{
    NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:mapUrlStr]];
    //this will set the image when loading is finished
    dispatch_async(dispatch_get_main_queue(), ^{
        cell.CellImageView.image = [UIImage imageWithData:imageData]

    });
});