Dell Precision 5520 - Slow external Samsung T3 SSD

Just got my new Dell Precision 5520. 32 GB RAM, Intel 7700, internal M.2 SSD 500, Hi-Res screen. I have a problem connecting an external Samsung T3 1 TB SSD. No matter if I connect to USB 3.0 or USB-C Port, the transfer speed to the SSD is only 34-38 MB/s. Even my older WD external USB 3.0 HD is about double as fast? The Samsung SSD works fine on another Laptop with USB 3.0, at about 260 MB/S speed. Windows 10 64 latest Update, and all available Dell Driver updates installed. Any idea how to improve? Manfred
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RE: Dell Precision 5520 - Slow external Samsung T3 SSD

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RE: Dell Precision 5520 - Slow external Samsung T3 SSD

C is the internal SSD, D is the Samsung T3, and E is a 2 TB USB 3.0 WD external Drive.

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RE: Dell Precision 5520 - Slow external Samsung T3 SSD

Anyone has an idea how to improve the speed for the external SSD?

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