error with fb graph post image

it will be just like repeated question on first look but it is not please read it till the end.

I can able to post images using the fb graph api.

1) I am able to post photos but it takes around 2 to 2.5 minites how to optimize it ie how to make it will take lesser time? 2) during the posting it give me nslog on ever 10 seconds like this

 void SendDelegateMessage(NSInvocation*): delegate (webView:resource:didFinishLoadingFromDataSource:) failed to return after waiting 10 seconds. main run loop mode: _kCFURLConnectionPrivateRunLoopMode

how to code so i dont get this log?

My code for calling fb graph is from this example

Solution

Ok from the link or the question link given by @lgy i got the best working solution it is as below

UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

thanks to @Tuan Nguyen who give the answer there i just repeat it as it helps me a lot and newSize is CGSize type variable Happy Coding :)