i5-1235u long ago bought and everything is normal, but just now discovered: left front usb 3.0 write speed on fast flash drive Transcend ~30 MB, on the right ~60 MB. both blue.... what could it be?
Are you testing the two USB 3.0 with different USB device at the same time ?
What is your BIOS version ?
Please turn off the PC , unplug the power supply, and press the pinhole of CMOS with a pin for about 10 seconds , restart the PC after ten minutes.
Disabling "Allow the computer to turn off the device to save power" on the Universal USB Controller had an effect - the speed increased by 2 times to 60-80 MB/sec. Thanks to the support of bee-link.com!!