I can confirm this issue. Since some MX-Devices (With Adv Security License) upgraded to 17.10.2, all Clients (PC, Laptop, iPads, Smartphones) which are connected to the MX have performance issues with several websites including sites like Amazon, Ebay etc. Only after removing all of the threat categories which we had applied before, the performance went well immediately. Deactivating IPS wasn't necessary, in my case it seems to depend only on the categories, which I'm going to activate again one by one to see which of them exactly causing the issue. The problem is that even whitelisting some of the sites didn't worked..
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