And? What does that have to do with my question? I was asking about something that would offload the cryptography processing, taking some strain off my router's CPU. And how do you know the CPU would be faster? Based on what? Faster in what sense? I'm talking about a device that would probably have a custom logic chip that handled a particular cryptography algorithm. How can you be so sure a custom chip would be slower? What's your source?
I was just asking if such a device exists, from people's lack of knowledge of such a device, it sounds like it probably doesn't exists. That's all I needed to know.
Also, USB3 supports up to 5 Gbit/s according to Wikipedia. My router at the moment only supports up to 20 Mbit/s with a VPN. What gave you the idea that my current bandwidth was more than USB3.0? Even USB2.0 might be faster than my connection, according to Wikipedia: https://en.wikipedia.org/wiki/USB_3.0. Even though it would only be a small improvement, it would still take load off my main CPU, letting it do other things, so if the price was right it would still be worthwhile.