I'm using jQuery to post to an ASP .NET Web Service to implement a custom auto-complete function. The code works great, except it's slow in FireFox (can't get it to go faster than 1 second). IE is blazing fast - works great. I watch the post in Firefox using Firebug.

Here's the service code:

<ScriptService(), _
WebService(Namespace:="http://tempuri.org/"), _
WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1), _
ToolboxItem(False)> _
Public Class TestWebSvc
  Inherits System.Web.Services.WebService

  <WebMethod(), _
  ScriptMethod(ResponseFormat:=Script.Services.ResponseFormat.Json, UseHttpGet:=True)> _
  Public Function GetAccounts(ByVal q As String) As Object

    'Code taken out for simplicity

    Return result

  End Function

End Class

And the jQuery ajax call:

$.ajax({
    beforeSend: function (req) { req.setRequestHeader("Content-Type", "application/json"); },
    contentType: "application/json; charset=utf-8",
    type: "GET",
    url: "http://localhost/Suggest/TestWebSvc.asmx/GetAccounts",
    data: "q='" + element.val() + "'",
    dataType: "json",
    success: testWebSvcSuccess
  });

As you can see, I've tried to use the HTTP GET verb instead in hopes that that would make the call faster. As it does not, I'll probably switch it back to using POST if I can. Right now I'm just focused on why it's super fast in IE and super slow in Firefox.

Versions: jQuery 1.3.2; Firefox 3.0.11; IE 8.0.6001.18783 (64-bit)

Thank you for any insight you can provide.