I'm also using a vpn with the TAP-Win32 V9 adapter inside a Win7Pro guest, and I see very little download speed reduction when I use it (I'm getting about 3.5 MB/s out of a 3.7 MB/s connection using either Bridged or NAT). How are you testing your download speed? Have you tried running the vpn from the host to see if you have slowdowns there?
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