Fastest way to get DOMDocument from URL

I am writing a program that parses the DOMDocument of a given URL. If I use a WebView, this process takes a very long time. I suspect it is because a WebView will process data for display, even if the WebView is not connected to a window (is this true?). An alternative would be to bypass WebView and retrieve the data as follows:

Code:

NSData* nsdata;
nsdata = [NSData dataWithContentsOfURL:[NSURL URLWithString:someURL]];
NSString* myString;
myString = [[NSString alloc] initWithData:nsdata encoding:NSASCIIStringEncoding];

I now have the data as an NSString. But how can I turn this into a DOMDocument so that I can use the tools provided in the DOM libraries?

Is there a better way to do this?

A related question: What data does "dataWithContentsOfURL:" get? What if there are several files located at the given URL? Does it retrieve them all?

 

Thanks. I disabled automatic display of images. That seemed to speed things up a bit. I will look into NSXMLDocument more, but it seems at first glance that it does not enable me to use the DOM library directly.