Performance problem in running VSEP Package on WINDOWS 7 64-bit OS

[Glancy]

Hello,

I work on Visual Studio Extension Package for Visual Studio 2008.
Our package adds capabilities to Visual Studio to create custom project
using proprietary compilers.
A project created under this product acts just like any other Visual Studio
project.

This package has been tested with VS2008 on X86 based PCs and works fine on
32-bit OS versions like Windows XP, Windows Vista and Windows 7.

Now when I test the same package (built in X86) on Visual Studio 2008 in X64
PC with Windows 7 Enterprise 64-bit OS, the process for this packge
(devenv.exe) shows huge memory usage (Starting with 50MB, jumps to 1.4 GB),
making the CPU hanging for several minutes.

The package works as expected even after hanging. (Creation of new project,
Opening of existing project, Displaying Property Pages, Project Build, etc.)
But each of these operations takes greater amount of time to complete,
making CPU hanging with high memory usage.

This seems like the package has some performance issue with Windows 64-bit
OS platform.

Would like to know whether I need to build my package with 64-bit OS before
running it on 64-bit OS environment, or need to do any other platform support
specific things in order to make my package compatible with 64-bit OS.

One more thing to note here.
On Windows 7 64-bit PC, the Visual Studio 2008 as well as my package are
getting installed by default in the folder 'C:\Program Files (x86)' instead
'C:\Program Files'. The registry entries for these softwares are also shown
under the key 'HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node'.

Does this have any impact?

Appreciate any help.

Thanks in advance.