Slow html page load with IE9 on reboot - Credential Provider

Need quick help on this. We have investigated this to the most extent from our end.

We have a Credential provider that loads a HTML page for user input during logon.

If IE9 is installed on the system and on the first time after reboot the HTML page takes up 10-12 secs just to load. The time lag between OnInitDialog and OnDocumentComplete is somewhere between 10-12 seconds. The delay varies from system to system and one of our customer systems, it in fact takes about 30+ seconds. The delay is only on the first time launch which unfortunately happens at logon time for us (CredProv).

We could easily reproduce this issue using Microsoft's sample CredProv code and by customizing it to display a HTML dialog (HTML dialog launched from a separate thread CreateThread called from CSampleProvider constructor). This should be simple to reproduce for Microsoft guys. I can upload the modified Microsoft Sample Credntial Provider code if needed. We believe this is to do with some Microsoft services relating to IE9 that load/start slowly with IE9. We have seen this on both Win7 32-bit and 64-bit systems.

Uninstall IE9 and revert back to IE8 - the delay is gone and we are back to 3-4 seconds for html page launch.

Please do note that we have tried the basic options such as:

1. Running MSFT fixIt.

2. Disabling all Add-Ons.

3. Trying the experiment on a clean system.

4. Also tried setting various BrowserEmulation modes (http://msdn.microsoft.com/en-us/library/ee330730(v=vs.85).aspx).

Nothing has resolved this issue so far. We plan to recommend our customers to not move to IE9 browser until this issue is resolved.

Please update if anyone has an idea on how to fix this issue.

Thanks - VK Austin

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