Ok, this won't be a technical review or a rating of measured speeds. It is simply a review from a consumer point of view. I have bought a couple of these MicroSDXC memory cards for tablets, and have seen no lag in saving data. I also use them for digital cameras, and have been very happy with the record time - it's instant. You can get into the MB/s on various cards, but usually, the difference is not something that anyone would notice or see. For the price, this is an excellent memory card, and I would highly recommend it.