SD Card Serious problem

[GeoffH]

There is a serious problem with the performance of the external SD Card access speed, having bought an Xperia XZ2 Premium I decide to upgrade my existing (Old SD Card) from my Xperia Z1, I purchased a Samsung EVO Plus (U3) spec card only to find that it cannot operate at at 90Mb/s in my new phone meaning I wasted my money if this is not fixed, I have moved my Camera Storage to the internal Memory for now - not something I am happy about.

It seems tha all owners of Xperia XZ2 and Premium models are experiencing this issue.

It needs to be looked at as a serious problem 

[GeoffH]

https://forum.xda-developers.com/xperia-xz2/how-to/micro-sd-read-write-speed-t3783000/page4

[F1Racer]

I'm wondering if you got a fake Samsung SD card, beware you can find them everywhere online.  These are made in china junk, with printed speed and specs not match actual performance.  That said, I did try both versions of the XZ2 Premium, one International HK, one my current US spec. XZ2P.  I didn't notice this on the int'l model, but did notice significant slowing on the US model XZ2P.  I was wondering if I had a problem with the SD card, now it looks like maybe not.

[GeoffH]

yes there are fakes out there but I also tested this card on my PC and it is fine, and if you took the time to read the thread that would be quite evident