Mysterious Statements Like 'aspnet_wp.exe' (Managed (v2.0.50727)): Loaded 'jpgxkjws' In Output?

I have an asp.net page that's taking longer to render than we'd like. I've been doing some manual Debug.WriteLine type performance testing and I noticed some statements in my output window that look something like:

'aspnet_wp.exe' (Managed (v2.0.50727)): Loaded 'jpgxkjws'

These statements are showing up in my output window when I'm doing "xml stuff" in my code. For instance I see one of these types of statements getting written to my output window when I execute the following line of code (sandwiched between two Debug.WriteLine statements):

System.Diagnostics.Debug.WriteLine("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! In ToXml(), about to call XMLSerializer: " & Now.ToString("hh:mm:ss.ff"))
xmlSerial = New Xml.Serialization.XmlSerializer(Me.GetType, xmlRoot) 'See a "loaded statement when this executes
System.Diagnostics.Debug.WriteLine("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! In ToXml(), finished call XMLSerializer: " & Now.ToString("hh:mm:ss.ff"))

These statements are pretty expensive, averaging about .75 seconds apiece. Any idea what these are and if it's possible to speed them up? Are these just statements just a artifact of my running my site in debug mode?I was initially perplexed that I couldn't find these files anywhere, but I ran procmon while debugging my asp.net site and did find where these files are located, they are located in

C:Documents and SettingsmyhostnameASPNETLocal SettingsTemp