I just took up the WTFast offer, and saw my ping drop from "260ms to 160ms".
Eye-balling it from the estimations back in 488, there's roughly a 3% increase.
Previously my average was around 620, i'm not seeing any numbers less than 630.

Max 654.64 @26.9%crit (xpot, party, food, no_mercy, 3:18s)
Probably at least 660 at 29% or something.