Funny! I kind of thought you might have that reaction.
Have you tested the LCD SD card using the 10pin cable from Panel Due to Duet? I've created a thread here just wondering if the speed I was getting was normal or maybe slower than normal and due to a cabling issue. It's here if you care to test yours and report back.
https://www.duet3d.com/forum/thread.php?id=1657
take care,
Brendin