Usb transfer rate problem with bootcamp

hello
drivers for uEye cameras are only available for windows platforms. so i am running windows xp on the latest mac mini with the latest bootcamp drivers in order to use the camera.
everything works great until i plug in another usb device. the transfer rate of the camera decreases dramatic (1/2). the second usb device is an usb hub with a microcontroller. it consumes only low transfer rates.
this constellation works perfect on other pcs. i can't compare it on os x because no drivers for the camera are available.
are there known issues with usb transfer rates on intel mac minis? firewire cameras and harddrives should suffer similar problems.
greetings
michael

are there known issues with usb transfer rates on
intel mac minis? firewire cameras and harddrives
should suffer similar problems.
Welcome to Apple Discussions!
To address this specific point - no, there are no known issues with USB transfer rates that are common to Macs but not PCs. The weakness of the USB standard is that it is controlled by the host system rather than a dedicated controller, thus transfer rates (on both Mac and PC platforms) are determined by what the system is doing overall. As a result, transfer rates vary quite dramatically. Firewire, on the other hand, has a dedicated controller which ensures that a consistent data rate is achieved, almost regardless of other system activity. That's why you will often see it recommended that FW is used for external drives rather than USB, since while USB will generally provide better burst rates of data transfer, FW will generally provide far better sustained data rates, despite being theoretically slower.
In your situation, I can't help but wonder if the hub you mention is not causing the system some issues. It would not have to be a matter of it causing any significant data transfer itself, but could be the result of the hub's controller forcing the system into activity which then suppresses potential performance from the camera.
One thing is sure: if the camera works well without the hub connected, but degrades in performance with it, the issue is not with the system or the camera, but the hub.

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