[MonoTouch] Slow XML Parsing Performance

[Phil Jepsen]

I have a WCF service method which returns Gzipped XML to my app.

The method returns ~1000 records, producing an uncompressed file size of
~500KB  (compressed is ~64KB).

To process this XML I am using the XmlReader which is the Fastest method.

I initially tried loading the entire Xml Doc into memory (XDocument.Parse)
and using Linq to objects, but that is almost twice as slow.

To get the stream takes ~8secs,  to process the Xml is ~35secs.


This is way too slow.  The simulator in comparison takes 0.3 seconds to
parse the XML.   From what I've been reading on the web I should be getting
better
parsing performance.  Also of note is that I am doing all my data access in
background thread.



Example Code:

Stream stream = new GZipInputStream(response.GetResponseStream());

using (XmlReader reader = XmlReader.Create(stream, settings)) {
                reader.ReadToFollowing("Data");
                while (!reader.EOF)
                {
                    switch (reader.NodeType)
                    {
                        case XmlNodeType.Element:
                        {
                            if (reader.Name == "Data")
                            {
                                  XElement el = XElement.ReadFrom(reader) as
XElement;
                                  obj.Add(new Obj( (string) el.Element (ns +
"Name").Value
                                 .....



Please help!

Thanks,

Phil Jepsen
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