Will you believe what I did? I hacked the ECU code so I can log faster! With the engine not running I can log 44 samples per second. When logging during normal operation (load cell, RPM, injector duty cycle, O2 sensor, ...) it decreases to 3-6 samples. Not that much.
I hacked the code and now I can log with 125 sampls per second with the engine off!
I've yet to test it in practice with the engine running. But that should translate to 8-20 samples per second.
Maybe I can increase logging speed even more!
It works perfectly fine with my active USB cable.