I totally agree with you!
Regarding the issue with Micro SD card, I managed to buy Samsung Pro Plus card 128 GB which supports up to 95 MB / sec read - and 90 MB / sec write.
Very very disappointing....
This Chuwi Hi12 seems to only supports USH-1 card and no USH-3 cards.
The speed never reached further than 20 MB / sec in BOTH read and write....
So if you guys wanna try out other card, please report it in this thread so maybe we can help each other out. I mean: it IS a bummer to buy expensive Micro SD card and then find out the Micro SD card reader from Chuwi doesn't support higher speed USH-3 .
Waste of money on those expensive cards then.
To be honest: if you gonna install casual games from Steam or maybe even League of Legends on this tablet, I would rather recommend you to install it on USB 3.0 -pendrive.
On USB 3.0 pendrive, I managed to get write and read speed above 100 MB / sec!
So that is very impressive but don't make the same mistake like I did to install it on Micro SD. You will be disappointed with both loading time AND installing time...
Installing League on Micro SD card didn't work for me at all, half way through, the program just stopped and it was very very slow. Probably the slowest installation I have ever seen in my life.