Classic ASP XMLHttp Send very slow - vbscript

Question

I've inherited a classic asp project and as part of the upgrade process we're moving a lot of the business logic to a REST API (WebApi 2.2)
The authorization endpoint for the api is written, and the asp site can call it, but it's very slow compared with calling directly via Postman.
(I'm a C# coder not a VBScript one so the below code may be offensive)
Asp Code:
' Send a prebuilt HTTP request and handle the response
' Returns true if the request returns a 200 response, False otherwise
' Response body is placed in Response
' ErrorMessage is set to return status text if an error code is returned
Function HandleRequest(ByRef objRequest, strBody)
set profiler = Server.CreateObject("Softwing.Profiler")
HandleRequest = False
' Add auth token if we have it
If Not m_accessToken&"" = "" Then
objRequest.SetRequestHeader "Authorization", "Bearer " & m_accessToken
End If
' Originating IP for proxy forwarding
If Not m_clientIp&"" = "" Then
objRequest.SetRequestHeader "X-Forwarded-For", m_clientIp
End If
On Error Resume Next
If (strBody&"" = "") Then
objRequest.Send()
Else
profiler.ProfileStart()
objRequest.Send(strBody)
flSendRequest = profiler.ProfileStop()
End If
If Err.Number = 0 Then
Dim jsonResponse
If (objRequest.ResponseText&"" <> "") Then
profiler.ProfileStart()
set jsonResponse = JSON.parse(objRequest.ResponseText)
flJson = profiler.ProfileStop()
set m_Response = jsonResponse
End If
If objRequest.Status = 200 Then
HandleRequest = True
m_errorMessage = ""
Else
m_errorMessage = objRequest.statusText
End If
Else
m_errorMessage = "Unable to connect to Api server"
End If
On Error GoTo 0
End Function
You can see there's some profiling code in there.
The following post request takes 392ms
POST localhost:5000/oauth/token
Content-Type application/x-www-form-urlencoded
client_id:ABCDEF0-ABCD-ABCD-ABCD-ABCDEF-ABCDEF01234
client_secret:aBcDeF0123456789aBcDeF0123456789=
username:demo
password:demo
grant_type:password
If I issue the same request direct to the Api via Postman it takes 30ms.
That's more than 13x slower.
What gives?
Edit
Raw result from Softwing Profiler:
flJson 10.9583865754112
flSendRequest 392.282022557137

Answer 1

So after a lengthy-ish discussion with the #J-Tolley it looks as though the issue is with the Softwing.Profiler documentation which states;
all results are given in milliseconds
even though earlier in the page it states;
has a ten milliseconds resolution
Have not used the Softwing.Profiler component alone before and would recommend anyone using in a Classic ASP environment to implement it using the SlTiming class library provided by 4GuysFromRolla.
In that article it even warns anyone using the Softwing.Profiler ProfileStop() method to;
Be aware that Softwing.Profiler's ProfileStop method returns a value in ticks (tenths of milliseconds).