This map is defined as Class 10 and even supports the latest Speed Class UHS-1 (the 1 in the "U"). Although my phone supports UHS-1 is not, but the card was low. Measured with my USB 3.0 card reader on your computer (multi-card reader (SDHC / SDXC)) I have the following speed:
52MB / s read speed
19MB / s write speed
The card is so really fast. Of course, this brings only what, even if the phone or tablet where the card is used, the support rate.