It is true that XenForo heavy scripted app. But KnownHost is also not a beginner in the web hosting world. If they are providing something then surely their machines have the capacity to take the load off them. It all comes down to your requirement. Whether your site will be able to run on it or not. If you are mulling about buying from them then just contact them and tell your traffic details along with how much you are expecting during peak hours. They surely will provide some insightful info about it.
"IF YOU CAN'T MAKE IT, FAKE IT"
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