socket stream does not work correctly IOS8

I am creating an IOS game with socket IO and node js in the background with megabits socket for the IOS client. I have a 100ms timer that ticks and updates the clients' timer in that interval. I have an IOS7 iPhone 5 in which it works spectacular. However, the IOS8 iPhone5s the millisecond interval seems to act weird. It seems to hang for 800 ms, then quickly tick 0-10 in 200 ms instead of evenly distributing the tick. this is the code I am using when I receive them time from the server.
My questions are as follows:

1. is 100ms updates too fast for a socket client? I was reading through some game makers' node stuff and it seems to stream every 30ms so I didn't think it was an issue.

2. I have seven apps out , and every one of them broke for IOS 8. is there a different way to do this in IOS8 that would be more efficient/ should I use something rather than dispatch to run on a diff thread?

I should note running on main/background thread made no difference. It is weird that all my IOS7 devices work fine, and this problem only occurs on IOS 8.

       [SIOSocket socketWithHost: @"host" response: ^(SIOSocket *socket)
         {
          self.socket = socket;
           __weak typeof(self) weakSelf = self;
         self.socket.onConnect = ^()
         {
        if(ftick)
        {
            [weakSelf addToPool];
            NSLog(@"@@@");
            ftick  = NO;
        }
    };
     [self.socket on: @"upTimerClicked" callback: ^(id time_left)
     {
       dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
         dispatch_async(queue, ^{
                incrementer++;
                if(incrementer > 9)
                {
                    incrementer = 0;
                    gameScore++;
                    gameScreen.score = gameScore;

                    NSLog(@"up timer clicked %d",incrementer);

                }
     dispatch_async(dispatch_get_main_queue(), ^{
                 incrementers++;

                 NSDictionary *tleft = time_left;
                 NSString *hr = [tleft objectForKey:@"hours"];
                 NSString *min = [tleft objectForKey:@"mins"];
                 NSString *sec = [tleft objectForKey:@"secs"];
                 NSString *mil = [tleft objectForKey:@"millis"];
                 NSLog(@"up timer clicked %d",incrementers);
                 NSString *formattedTime = [NSString stringWithFormat:@"%@:%@:%@:%d",hr,min,sec,[mil intValue]/2];
                 [gameScreen tickCountUpTimer:formattedTime];


             });

 }];

Thank you in advance.