Please help: Extremely slow USB transfer

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Elmue

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Please delete this message
I cannot find a "Delete" button
 

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I get around 950kByte/s connected to the PC directly and about 1050kByte/s with a USB 2 hub (no issues with either Linux or Windows).

Your computers likely have 2 separate USB controllers connected to the same ports, a USB 1.x controller and a USB 2 (or 3) controller. Your computer switches the controller based on the connected device. There may be bugs in the USB chipset on either side. Putting a USB 2 hub in-between may fix things. This will put your computer into USB 2 mode. There are also completely different USB drivers used on the Windows side when you switch to USB 2 by using a hub.

OpenHCD suggests some OHCI non-Intel controller. Are all your machines using some AMD USB controller? The USB 1 stuff inside might be identical for all of them.
 
Delete the post, because I already found the error in my code.
Yes, now I also get 1 MByte / second on Windows 10.
 
It would be much better to share your solution to help someone solve a similar problem.
 
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