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Need advice on preformance (web service returns list items on 20000 rows list)

Posted By:      Posted Date: September 16, 2010    Points: 0   Category :SharePoint
Greetings I need to write a web service that will return sharepoint list items (default web services of sharepoint are no use to me since they just suck when the site is not in english).  Since we have lists with 20k+ items, the return xml might get large. Query web service did manage to do it, yet it took some time to output the xml with those 20k rows.  I am affraid that my custom made web service will preform poorly since it wont be "native" to sharepoint. I am asking for your judgement, did i fell into common pitfalls or something or is there any way to improve preformance of my code? My own web service code looks like this:   [WebMethod] public XmlDocument GetListItems(string siteurl, string listguid,string querytext,string rowlimit) { InitSchemaExporter(siteurl); SPQuery query = new SPQuery(); query.RowLimit = rowlimit.Length==0?10:Convert.ToUInt32(rowlimit); query.Query=querytext; return SchemaExporter.GetListItems(listguid, query); } public void InitSchemaExporter(string siteurl) { SchemaExporter.SetSite(siteurl); SchemaExporter.IgnoreField = ConfigurationSettings.AppSettings["IgnoreField"].Split(new string[1] { "\r\n" }, System.StringSplitOptions.None).ToList<string>(); ; SchemaExporter.IgnoreList = ConfigurationSettings.AppSettings["IgnoreList"].Split(new string[

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