Then check if this does the trick for you. Please try multiple cards and check if all the cards are read slowly.
Select the country and enter the product# of the unit. Then follow the on-screen instructions.
Then uninstall the memory card reader drivers from device manager and restart the computer.
Right-Click on start button> click device manager> expand Memory Technology Devices>then select the memory card reader and right-click on it and uninstall the card drivers. Then restart the computer and update the bios and chipset drivers from this link: http://hp.com/drivers