FSCTL_IS_VOLUME_MOUNTED causing HUGE DELAYS

We're using Rainbow Portal .NET v1.5 as our CMS on Windows 2000 Pro (Development) & Advanced-Server (Prod) to compose many of our sites. We develop several .ASCX controls and Rainbow easily plops them onto a dynamically created page. I've been asked to look into why a paritcular area of our site is running slowly as compared to other areas. I discovered several blotttlenecks and have resolved them to the best I could but one remains.

When i hit the page there is normally a 5 sec delay before the IE browser displays the site. On subsequent refreshes it takes about 1 sec. Clearly ASP.NET has cached what it needs. I then wait for about 2 mins and do a refresh again within the IE browser. Now the page takes about 5 secs or so to display. I dont get it. I thought .NET already had the page cached?

I then launched FILEMON to investigate all the IO file access by ASPNET_WP.exe and INETINFO.exe. Several Rainbow files (theme, layouts, dlls) are accessed but these consume less than 1 sec. The majority of the time was spent here:

1:35:11 PM sqlservr.exe:688 WRITE C:\Program Files\Microsoft SQL Server\MSSQL\Data\Rainbow_log.ldf SUCCESS Offset: 7912448 Length: 512
1:35:13 PM aspnet_wp.exe:2488 OPEN C:\winnt\microsoft.net\framework\v1.1.4322\temporary asp.net files\root\061162b5\7a6ac1c\assembly\dl2\c9b3b93f\b2d1d96e_8893c501\solpartwebcontrols.dll SUCCESS Options: Open Access: All
1:35:15 PM inetinfo.exe:1140 OPEN C:\PROJECTS\RAINBOW\DESIGN\THEMES\NEWCOUNTYSITE\DEFAULT.CSS SUCCESS Options: Open Access: All

You can see a time of 4 secs was consumed. I discovered an Advanced mode of Filemon and it revleaed:
aspnet_wp.exe:2488 FSCTL_IS_VOLUME_MOUNTED C:\WINNT\system32 SUCCESS

This line is repeated several times before and after the .DLL and is consuming the majority of the time. On refresh of the page, it does not exist whatsoever. Any ideas on why this is occurring the way it is and how to resolve it?

 

Yeah i checked all of them. 10 results but there is nothing remotely talking about it. WHat a shame. I'd appreciate any of your inputs. Is there a tool better than FILEMON which could provide more insight?