There's a range of ways that a VPN can affect speed, and particularly if you're measuring speed from the machine that's connected by the VPN, that's usually going to be a lot slower than your broadband. If you're connecting over wifi as well, then that may be part of the speed issue as well.
If you want to test your broadband speed, disconnect the VPN, then measure speed using a machine connected to the hub by an ethernet cable.
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