Update:
Small test with "H2testw" on a Lenovo Thinkpad with Intel Core i5 2nd generation USB 3.0 RENESAS PD720202 on ExtressCard34 Insert:
Warning: 512 15073 MByte tested.
Ready, no error occurred.
You can download the test files * .h2w now delete or check again at will.
Write rate: 17.8 MB / s
Read rate: 75.6 MB / s
H2testw v1.4