Extremely slow at USB 2.0 port

From a quick transfer is mentioned, which is to be USB 3.0 and backwards compatible with this card reader in the product description. My PC only has one USB 2.0 port and because of this Rocketek reader is the purest brake. The same applies for the connection to a tablet PC. The card reader was intended by me to transfer photo files to PC and tablet PC.

In practice, the saw in the test with a data volume of 170 MB (32 JPG images) with the same Micro-SD Card (with SD adapter) as follows:
--Übertragungsdauer When connecting the digital camera to the PC (USB 2.0) - with the SD card directly into the card slot on the PC - the micro SD card directly into the slot of the tablet PC: 25 seconds.
--Übertragungsdauer The Rocketek-Card Reader: Connection to PC (USB 2.0) - Connect the tablet PC via an adapter cable: approximately 2:50 minutes slows the reader the full transfer from.

As the part 3.0 port is working on a USB I could not test, but the transfer was finally on the Tablet PC as slow. Under USB 3.0 backwards compatible I understand something else. Now have the TRANSCEND USB3.0 SD / microSD Card Reader. Since the data flutschen over as usual.