Host OS slow to find network path to guest OS on VirtualBox

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http://serverfault.com – I am running VirtualBox 4.1.6 on Windows 7 on fairly quick machine with 12G of ram. I have a virtual machine running Ubuntu 11 on which I am doing rails development. When I run up the WebBrick server and try to browse to the site from the host OS (Windows 7), there is a long delay before the page is returned, and its the same for subsequent requests. Accessing the server inside the virtual machine is quick. I am running in bridged mode but have tried a few options it doesn't seem to help. I can ping from the host the guest OS without any perceptible delay. I haven't tried another web server li (HowTos)