run/walk breaking point?

i was just wondering if there is a breaking point for a necro's (or any class for that matter) faster run walk because i have about 35 small 5% faster run/walk charms, some ik boots that have 40% fr/w, mav's belt that has 20% fr/w, and trangs armor that has 40% fr/w... the reason i am asking is because i dont notice a difference when i take off trangs and mav's.
if u dont feel like doing the math that is 275% faster run walk
and i am hoping that there is a breaking point so that i can use some small life charms