With a top configured FSX this "FIBER ACCELERATOR" does absolutely nothing. I bought it and made a serie of test at EGLL, KJFK and Paris Charles de Gaule, all very crowded airports with lot of traffic (my traffic set to 60%). Result, absolutely no difference. Aicraft used, stock FSX Acceleration arcrafts single and twin props + heavy jet B747 take-off and approach.
By the way, I did not catch what the word FIBER has to do in this joke. Furthermore, considering how FSX is tuned, essentially through its Config file adjustments, I do not see how an external programm could dynamically change these settings while you fly without crashing the program ?