I have just tried it out. HotSpot established with mobile phone (Nokia 7.2, O2, normal LTE). I didn't notice any difference to the normal (very fast) W-LAN.
However, I also assumed beforehand that this was the case. I bought the device (also) to use it on the road, and most of the time it will have to run via a mobile hotspot.
I'm also quite taken with the device otherwise. It's intuitive and fluid, and most apps are available in the store. What I miss is Sky Ticket. But Xiaomi can't do anything about that ...
Rocksresort Laax: win a stay for 4 people
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We're giving away a voucher for Rocksresort Laax: 2 nights in a family flat for 4 people.