Massive ScriptResource.axd - is this caused by ASP.NET AJAX?

Question

I'm running fiddler against my live website which uses a bit of ASP.NET AJAX and a bit of query. I'm noticing a MASSIVE ScriptResource.axd file of 300KB

Starts off like this

// Name:        MicrosoftAjax.debug.js
// Assembly:    System.Web.Extensions
// Version:     3.5.0.0
// FileVersion: 3.5.30729.196
//-----------------------------------------------------------------------
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------
// MicrosoftAjax.js
// Microsoft AJAX Framework.

Is this just the weight of the ASP.NET AJAX Javascript library?

Answer 1

Don't forget to switch your javascript libraries to non-debug versions. They are a lot smaller in size.