WebDAV - understanding the codes

We are using WebDav on a W2K3 STD server with SP2, running IIS 6.0.
We are having slowness issues when opening and saving documents using WebDav. So far we are unable to resolve. We are actually thinking this might be normal behaviour. But we hope not. Sometimes it can take up to 5 seconds to open and or save/close a document.
If it helps, we are using Windows XP with SP3 as the client that talks to the WebDAV server.

I'm trying to get a handle on the IIS log file. Can someone point me in the right direction to understand the logs, in relation to WebDAV? Below is an extract from the IIS log file. I'm interested in understanding the numbers / codes highlighted below - what do they mean?

2011-09-09 01:05:10 W3SVC1 192.168.XX.XX PROPFIND /webdav/webdav_isapi.dll - 80 - 192.168.XX.XX Microsoft-WebDAV-MiniRedir/5.1.2600 401 2 2148074254
2011-09-09 01:05:10 W3SVC1 192.168.XX.XX GET /webdav/llisapi.dll document 80 User 192.168.XX.XX Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.1;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET+CLR+3.0.4506.2152;+.NET+CLR+3.5.30729) 200 0 0
2011-09-09 01:05:10 W3SVC1 192.168.XX.XX PROPFIND /webdav/webdav_isapi.dll - 80 User 192.168.XX.XX Microsoft-WebDAV-MiniRedir/5.1.2600 207 0 0

Thank you in advance for any assistance.
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ictinfrastructuresupportConnect With a Mentor Author Commented:
Thank you for your answer. We have tried all the basics and it hasn't really helped.
We are bringing in the big guns (external consultant) to assist.

Brad HoweDevOps ManagerCommented:
At the top of every log file you should see the following.

#Software : Microsoft ....
#Version : 1.*
#Date: 2011-**-** **.**.**.
#Fields: date time s-sitename etc.......

Those numbers in particular are

HTTP Status              sc-status               - The HTTP status code.
Win32 Status           sc-win32-status     - The Windows status code.
Protocol Substatus  sc-substatus          - The substatus error code.

Now this verbs GET and PROPFIND are valid commands. PROPFIND for example is used to locate the value of a property on an item in a public folder.  
GET is simply GET the page.

Now for your issue, it is hard to pinpoint one exact cause. I would start with the basics.

1. Review your network settings on the local machine.
2. Disable any Antivirus software and try again.
3. Disable any firewall software and try again.
3. Are these machines on a domain with GPOs? If so, try from a machine that is not bound to the domain.
4. Log on as a new user, or create a new user account, and then test the new logon.

Hope it helps,
ictinfrastructuresupportAuthor Commented:
We have decided to bring in external contractor on-site to assist with a resolution
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