How much run speed can I have before it becomes useless?

[Emgiell]

Currently have 3 mains and 6 subs on run speed, should I go further or is this already maxed?

 

[TheReflexWonder]

For literal uselessness, it doesn't actually cap, but diminishing returns start hitting it pretty hard after 3 Mains (which is the case for every stat, iirc; they all give you less for each extra one you have).

 

[MakesDream]

max run speed out and listen to green hill zone as you zip past your enemies while they drown in their tears.

run speed is one of my favorite abilities. if you feel like you don't need any other abilities. 3 mains and 9 subs of run speed would be something else, haha.