I am using "SanDisk Extreme Pro SDXC UHS*I U3 V30 128 GB 95 MB/s" Cards.
When I copy the Files to my computer I only got around 39 MB/s transfer rate.
Using "Lexar Professional USB 3.0 Dual-Slot Reader". When I am using an USB 3.0 Stick I got 230 MB/s and more.
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Card Reader works fine. I copied the DNG files to another card. (tanscend 90 MB/x / 600x)
and then copy it back to my PC... and got read spead up to 160 MB/s.
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I got four "SanDisk Extreme Pro SDXC UHS*I U3 V30 128 GB 95 MB/s" Cards.
All the same. Recoding in rar 3:1 slow motion 60fps is fine. No frame dropping.
So I think the cards are fine.

Is it normal that the read spead is only at 39 MB/s? Specs show that it must be around 90mb/s.
And i though read speed is allways faster than write spead. hmmm