Как получить данные json с сервера эффективным и быстрым способом?

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Hey folks, I've the following code to get data from server but it takes too long to load and show in tableView. I need it to be done in faster way.
I have my NSURLRequest in viewDidLoad.

- (void)viewDidLoad {
    
    NSNumber *getID=connectorClass.IdBeingPassed;
    NSString *getname=connectorClass.movieNameBeingPassed;
    
  
    
    NSNumber *getVote=connectorClass.voteBeingPassed;
    NSString *myNumberInString = [getVote stringValue];
    NSString *movieIDinString= [getID stringValue];
       _labelText.text=getname;
    //------castApi----//
    
    
   
    [super viewDidLoad];
    [[self tableView2]setDelegate:self ];
    [[self tableView2]setDataSource:self];
    array=[[NSMutableArray alloc]init];
    
    NSString *castString = [NSString stringWithFormat:@"https://api.themoviedb.org/3/movie/%@/credits?api_key=c4bd81709e87b1208609433c49",movieIDinString];
    NSURL *url=[NSURL URLWithString:castString];

    NSURLRequest *request=[NSURLRequest requestWithURL:url];
    connection=[NSURLConnection connectionWithRequest:request delegate:self];
    if (connection)
    {
        webData=  [[NSMutableData alloc]init];
    }
    
}

Что я уже пробовал:

- (void)viewDidLoad {
    
    NSNumber *getID=connectorClass.IdBeingPassed;
    NSString *getname=connectorClass.movieNameBeingPassed;
    
  
    
    NSNumber *getVote=connectorClass.voteBeingPassed;
    NSString *myNumberInString = [getVote stringValue];
    NSString *movieIDinString= [getID stringValue];
       _labelText.text=getname;
    //------castApi----//
    
    
   
    [super viewDidLoad];
    [[self tableView2]setDelegate:self ];
    [[self tableView2]setDataSource:self];
    array=[[NSMutableArray alloc]init];
    
    NSString *castString = [NSString stringWithFormat:@"https://api.themoviedb.org/3/movie/%@/credits?api_key=c4bd81709e87b1208609433c49",movieIDinString];
    NSURL *url=[NSURL URLWithString:castString];

    NSURLRequest *request=[NSURLRequest requestWithURL:url];
    connection=[NSURLConnection connectionWithRequest:request delegate:self];
    if (connection)
    {
        webData=  [[NSMutableData alloc]init];
    }
    
}

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