A while back I had a similar speed problem problem with clients on on business SSIDs assigned via group policy. Guest SSIDs worked just fine. Turned out to be something in the settings that were being used. It had been on my to do list for a while to update the security protocols, so I didn't spend time figuring out what the issue was, just moved on to the next thing. In my case I needed to migrate to something new, so did a new SSID making sure everything is set to WPA2 only, AES (no TKIP), once that is what the laptops used, the speed increased immediately.
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