Inspiron 15 7591, SD card slot speed?

What is the speed of the SD Card slot on this laptop? It seems slower than I expected. I have tried 2 Samsung EVO Plus 128 GB microSDXC cards and get read and write speeds of only around 20MByte/s even though the cards are rated  "up to 100 MB/s read and 90 MB/s write speed with class 10 and U3 compatibility".

I have an update from the team. They have tested the system and received higher transfer rates on the system. Could you check a different SD card on the system and let me know if there is any difference?
DELL-Cares

Thanks for the offer to troubleshoot the SD card slot, but I think I'll decline. SD cards work in my laptop but are slower than I was hoping, and I don't think it's a problem so severe that it's worth putting more time into.
JeremyL9